I wouldn’t be too optimistic.
I can’t say anything about the Fairphone 4. I can only say that on the Fairphone 3 this worked for me in initial testing, until later users in Custom ROM territory reported that it didn’t, and Fairphone had this to say when the question arose because of a particular update … Software Update: 3.A.0129.20210805 (unknown caller and zero brightness bugs) - #433 by rae.
Perhaps @ray could bring some clarity for the Fairphone 4?