Posterize in FCP?
In the early days of DV camcorders there were several built-in effects including "Posterize" which produced a daubed painting effect.
The nearest I can find in FCP is the Comic Looks section but the effects are not the same.
I found a posterize download on YouTube but that appears to affect the timing and produces a strobe effect rather than a "painted" image.
iMac 27″ 5K, macOS 13.6