Thanks @Raulsc for the explanation. To me it still sounds like the solution that I had linked above should solve your ask. Please check out this solution again. For the “Show relevant values only” option to work, you need to create a control for your hidden filter. However, you can hide it from the end users as described on the linked solution.
I hope my solution worked for you. Let us know if this is resolved. And if it is, please help the community by marking his answer as a “Solution”.