In jinjia, as shown below, I defined a variable number

{% set number = unit %}

file_dict is a dict type variable. I want to reference the key in file_dict so as to find the value in file_dict where the key is {{number}}

{{file_dict{{number}}}}

It seems that it is illegal to define it like the above, and it cannot be passed.
In addition, macro definition cannot be used either.

{% macro get_value(number) %} {{ pdf_dict{{number}}}} {% endmacro %}

Is there any way to define nested variables