blockchain.info select value

Challenge: Show data from https://blockchain.info/tobtc?currency=USD&value=500 where USD and value is a parameter
Twig-Code:

{% set js1 = '{"AUD":{"15m":56862.25,"last":56862.25,"buy":56862.25,"sell":56862.25,"symbol":"AUD"},"BRL":{"15m":216138.04000000000814907252788543701171875,"last":216138.04000000000814907252788543701171875,"buy":216138.04000000000814907252788543701171875,"sell":216138.04000000000814907252788543701171875,"symbol":"BRL"},"CAD":{"15m":52090.6500000000014551915228366851806640625,"last":52090.6500000000014551915228366851806640625,"buy":52090.6500000000014551915228366851806640625,"sell":52090.6500000000014551915228366851806640625,"symbol":"CAD"},"CHF":{"15m":37742.550000000002910383045673370361328125,"last":37742.550000000002910383045673370361328125,"buy":37742.550000000002910383045673370361328125,"sell":37742.550000000002910383045673370361328125,"symbol":"CHF"},"CLP":{"15m":31656875.600000001490116119384765625,"last":31656875.600000001490116119384765625,"buy":31656875.600000001490116119384765625,"sell":31656875.600000001490116119384765625,"symbol":"CLP"},"CNY":{"15m":261461.48000000001047737896442413330078125,"last":261461.48000000001047737896442413330078125,"buy":261461.48000000001047737896442413330078125,"sell":261461.48000000001047737896442413330078125,"symbol":"CNY"},"CZK":{"15m":894931.2700000000186264514923095703125,"last":894931.2700000000186264514923095703125,"buy":894931.2700000000186264514923095703125,"sell":894931.2700000000186264514923095703125,"symbol":"CZK"},"DKK":{"15m":303074.2700000000186264514923095703125,"last":303074.2700000000186264514923095703125,"buy":303074.2700000000186264514923095703125,"sell":303074.2700000000186264514923095703125,"symbol":"DKK"},"EUR":{"15m":35069.7300000000032014213502407073974609375,"last":35069.7300000000032014213502407073974609375,"buy":35069.7300000000032014213502407073974609375,"sell":35069.7300000000032014213502407073974609375,"symbol":"EUR"},"GBP":{"15m":29829.75999999999839928932487964630126953125,"last":29829.75999999999839928932487964630126953125,"buy":29829.75999999999839928932487964630126953125,"sell":29829.75999999999839928932487964630126953125,"symbol":"GBP"},"HKD":{"15m":324448.5900000000256113708019256591796875,"last":324448.5900000000256113708019256591796875,"buy":324448.5900000000256113708019256591796875,"sell":324448.5900000000256113708019256591796875,"symbol":"HKD"},"HRK":{"15m":257774.390000000013969838619232177734375,"last":257774.390000000013969838619232177734375,"buy":257774.390000000013969838619232177734375,"sell":257774.390000000013969838619232177734375,"symbol":"HRK"},"HUF":{"15m":14884628.710000000894069671630859375,"last":14884628.710000000894069671630859375,"buy":14884628.710000000894069671630859375,"sell":14884628.710000000894069671630859375,"symbol":"HUF"},"INR":{"15m":3305117.8399999998509883880615234375,"last":3305117.8399999998509883880615234375,"buy":3305117.8399999998509883880615234375,"sell":3305117.8399999998509883880615234375,"symbol":"INR"},"ISK":{"15m":4487573.469999999739229679107666015625,"last":4487573.469999999739229679107666015625,"buy":4487573.469999999739229679107666015625,"sell":4487573.469999999739229679107666015625,"symbol":"ISK"},"JPY":{"15m":4564667.889999999664723873138427734375,"last":4564667.889999999664723873138427734375,"buy":4564667.889999999664723873138427734375,"sell":4564667.889999999664723873138427734375,"symbol":"JPY"},"KRW":{"15m":48062927.439999997615814208984375,"last":48062927.439999997615814208984375,"buy":48062927.439999997615814208984375,"sell":48062927.439999997615814208984375,"symbol":"KRW"},"NZD":{"15m":59722.0199999999967985786497592926025390625,"last":59722.0199999999967985786497592926025390625,"buy":59722.0199999999967985786497592926025390625,"sell":59722.0199999999967985786497592926025390625,"symbol":"NZD"},"PLN":{"15m":160240.98999999999068677425384521484375,"last":160240.98999999999068677425384521484375,"buy":160240.98999999999068677425384521484375,"sell":160240.98999999999068677425384521484375,"symbol":"PLN"},"RON":{"15m":161095.1900000000023283064365386962890625,"last":161095.1900000000023283064365386962890625,"buy":161095.1900000000023283064365386962890625,"sell":161095.1900000000023283064365386962890625,"symbol":"RON"},"RUB":{"15m":2938259.5600000000558793544769287109375,"last":2938259.5600000000558793544769287109375,"buy":2938259.5600000000558793544769287109375,"sell":2938259.5600000000558793544769287109375,"symbol":"RUB"},"SEK":{"15m":337152.0599999999976716935634613037109375,"last":337152.0599999999976716935634613037109375,"buy":337152.0599999999976716935634613037109375,"sell":337152.0599999999976716935634613037109375,"symbol":"SEK"},"SGD":{"15m":56843.5999999999985448084771633148193359375,"last":56843.5999999999985448084771633148193359375,"buy":56843.5999999999985448084771633148193359375,"sell":56843.5999999999985448084771633148193359375,"symbol":"SGD"},"THB":{"15m":1360980.78000000002793967723846435546875,"last":1360980.78000000002793967723846435546875,"buy":1360980.78000000002793967723846435546875,"sell":1360980.78000000002793967723846435546875,"symbol":"THB"},"TRY":{"15m":348629.6400000000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%}
{% set shcDosc = (js1 | doshortcode) %}
{% set shcArr = (shcDosc | json_decode(TRUE) ) %}



Value:






Result: {{nojsonvalue}}
In the above twig-code is “nameoftemplate=blockchaininfogetcurr”, in there is the URL https://blockchain.info/ticker and this twig 
{{ _context | json_encode }}
In Action:
Value:
Result: 0.01201562