Well, maybe, but only that which is compatible with SketchUp’s target core functionality.
Please read: SketchUp > Feature Requests: Vision and feature requests
There has been a new Collada revision since SketchUp’s importer and exporters were written.
We had discussed this (SketchUp’s DAE import / export handling) in another thread (in the my.sketchup category.)
See: MySketchUp should be able to open/edit/save and/or import/export COLLADA (dae) files
So for example, just because Collada has a bunch of nifty animation attributes, does not mean SketchUp must become an animation studio, because it has a DAE importer.
So, you need to make a valid “use case” for this vertex color data. Is it just for passing through ? Ie, DAE > SKP > some editing > DAE ?