I use UE5 and lumen, but lightmass gpu baking worked fine on a imported Chief model via Datasmith Sketchup plugin.
The 3ds export from Chief splits the model up nicely for lightmap baking since the plugin generated lightmap UV’s that are useful.
Just enable the GPU lightmass plugin, and Datasmith import plugins in project settings.
Not remember if 4.27 need them from marketplace or if they are integrated.
Several tutorials out there related to different settings and configurations.