Hey Benjamin,
Thank you for reaching out to us!
It’s certainly possible, but remains something that we do not support “out of the box”: some amount of custom dev work would be required to make this happen.
To get started, I would recommend you to read the following article as it explains how to create custom fields for filter bar (including examples):
https://theeventscalendar.com/knowledgebase/creating-custom-filters-for-filter-bar/
I would also recommend proposing this feature in our User Voice page to let us know.
Other users can then up-vote it, giving us a great idea of how much demand there might be (or, if you can find a suitable existing request, you can in turn up-vote that).
Thanks!
Patricia