JINJA2 issue

I need help resolving a syntax error in my JINJA2 code. I have a rough idea of what might be causing the issue, but I haven't yet pinpointed the source. I've been attempting to solve the problem for less than a day, with no luck. I'm looking for an experienced developer who can help me identify and solve the issue quickly. Thanks.

I want to concatenate 2 JSONs and form a new one