Flask, get value from checkbox and pass the result to another template

I am using Weasyprint, to display some jinja templates in a Flask Web App. I have this json.

value=["1","2","3","4"]

I have to pass 'value' to another jinja template in an if loop.

Liquid error: This liquid context does not allow includes.

But this shows the error,

TemplateSyntaxError: expected token ')', got '='

I thought I had to convert json to int in order to make the if loop work.