[Python] jinja2: convert string to dict object?

I have a json string stored in the database and when this is pulled out and shown on the template it is a string. I want to convert this into a dict object so I can access the contents directly.

string = "{'a':1, 'b':3}"

{{ obj }} ---> string "{'a':1, 'b':3}"

{{ obj.b }} ---> I want to access it like an object.

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