You are excited about Field Parameters in Power BI, but then realize you can’t use conditional formatting with them. What the french toast! Don’t despair! Patrick and Adam have some ways to get this working.
Matthias K. Question
https://youtu.be/ksmNfa_K8GQ?t=1011
Let report readers use field parameters to change visuals (preview)
https://docs.microsoft.com/en-us/power-bi/create-reports/power-bi-field-parameters
Apply conditional formatting in tables and matrixes
https://docs.microsoft.com/en-us/power-bi/create-reports/desktop-conditional-table-formatting