Support custom filters on JWM board

Currently, the issues on the JWM board can be filtered through some fields.
Filtering in Board, List, Timeline, and Calendar Views have multiple options to filter issues. Nevertheless, we can't select all of the available custom fields (through a custom search) within the filter section.

It would be great to include this custom option for all of the JWM views.

Use Case

I have a custom field (number) called New Test:

From the Timeline view, I can't filter by that specific field I just created:

The only available option would be to create a JQL with it, but then I lose the Timeline functionality.