@stevebaer will know more about the status of these in Compute; if they are not in the documentation they probably haven’t been made accessible through Compute yet.
rhino3dm is based on the public, free version of OpenNurbs that does not include things like format converters and advanced geometry functions, it will not have squish or import available.
If you can run Rhino locally on Windows, maybe try working with Rhino.Inside CPython instead? It basically like importing the RhinoCommon SDK in CPython, so there’s no need to wait for everything to be made available through Compute.