php – how to decode and print json in smart3-ThrowExceptions

Exception or error:

I am new with smarty. I have a key value paired json stored in my mysql table and I want to decode and print it with key without a loop. for example.

{
    "A": "100",
    "B": "200",
    "Cart": true
}

found decode method

*.$json|json_decode:1|print_r.*

but how i can echo like in php $json['A'];

How to solve:
{$myjson = $json|json_decode:true}

then

{$myjson['A']}

OR

{$myjson.A}

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