[Python] Jinja2 {% include file %} outside of search path doesn't work

This is an elementary issue which is probably related to Jinja2 PrefixLoader or ChoiceLoader.

On Python 3.6 we load with this command

jinja2.FileSystemLoader( searchpath= "\\template_folder\\")


On Windows 7, our file structure is as follows.


- folder_bbb
* subfile.txt
- template_folder
* template_file
- folder_aaa
* subfile.txt


From the template_file we are successful with this command

{% include "folder_aaa/subfile.txt" %}


Now we wish to move the file one level up, and write

{% include "../folder_bbb/subfile.txt" %}


but that doesn't work, complaining file not found.

What is the correct way to write? Thanks.

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