Format data for use with cBioPortal visualization tools

We may need to create a project or can make an example for importing the data. A bit more research is required.

The issue does not name a file, test, or existing entry point. First research cBioPortal's data-import requirements and inspect the example workflows in this repository; clarify whether the contribution should be a project or an import example before defining what a completed change would contain.

Written by the indexing model from the issue text.