How to bake lights for individual object, without overwriting existing baked data for the whole scene?

I am trying to use a different lightmapper for one particular object, because I like the results. I have tried to only have the objects which I want to bake at that moment active, but it stills erases the lighting data / maps for the disabled ones.

I managed to dig up a few answers on this question, however they are several years old and seem to no longer apply. I am using 2019.1.2. Appreciate any and all advice.