It definitely sounds like a situation where you'd use the exposure compensation dial. I used to get that all the time with slide film until I learned how to meter properly (I tend to point the camera at sunlit grass to get a reading, then compose and shoot. It works for me).
Unfortunately there is no 'exposure lock' function of the XA2. The only manual exposure control is adjusting the ISO, which is hard on the XA2 or the "+1.5" exposure switch.
Go not to the elves for counsel, for they will say both yes and no.