Filter CMS list by current item's drop-down choice


I have an item page and, within it, a CMS list of same item type.
I know how to filter according to a common reference field but is it possible to filter by same dropdown choice?
In my concrete example I have services (financial or legal) and want to show other “legal” services if the current service is “legal”.

Do I need a JS snippet?

Thank you!


Here is my public share link: LINK