How do you add meta data to a participant, so that it can be used as a multi value selection in a filter in a dashboard?

Example: I have some users that I want to mark as being part of an assessment in 2020, 2023 or 2024.  Each user can be in zero, one or multiple assessments.

I have tried to add the data as “2022, 2023” or even split it with semicolons, but even I then mark it in the dashboard setup as a Multi-Answer Text Set, then “2022, 2023” is still seen as ““2022, 2023” in the filter, instead of separate as “2022” & “2023”