I’ve successfully had stills moves from FCPX translate into Resolve. There are so many variables however that my success may have been lucky. Versions of FCPX, the fcpxml version and the version of Resolve matter for compatibility. In my case I think the editor used a stills tool that triggered the same move using dynamic zoom in Resolve as it activated dynamic zoom and the start and end framing was correct so maybe that way doesn’t rely on keyframes. Obviously proprietary third party plugins doing Ken Burns effect will not translate.
XML from Pr does include keyframes although the way Pr scales often makes those moves relatively correct but the frame sizing needs to be tweaked on the Color page.
In Resolve the only box to tick during a timeline import is “Use sizing information”. If that was ticked and keyframes are not importing then it is a matter of the source software and what the xml contains that can be correctly interpreted.