STL is the only 3D format in common between SketchUp export and Shapr3D import.
But you can’t edit STL mesh in Shapr3D, just perform some Boolean, scale or split body operations.
I know there are some free STL to STEP converters online, but I have never tried them. I would give a try if I were you.
As continuously testing the new silicon version of FormZ (that has a lot of conversion problem that previous version did not) this was a good opportunityto test .skp → .stp → .shapr (This as I do a lot a conversions back an fourth in my workflow).
I’m happy to share a model, but I’m really looking for a process since I’m moving from Sketchup to Shapr3D and have a bunch of models I may need to move over. Xdrakosha you mentioned using Fusion360 as an intermediary, is there a free version of Fusion360 that can do that? I do not have access to Fusion360 paid version.