Means to interact with Python Scripts are described in the page: EASE/Scripts - Eclipsepedia. # toolbar : <Name of the view> integrates to specific view (Properties for example).
If you want more “integrated” means like
you will have to develop something using extension points and contribute some code.
An other solution would be to develop a dedicated UI using Python4Capella to launch your scripts, there are some standard UI libraries directly usable. But this may take some time too.
Basically projects and frameworks like Capella and Sirius provide extension points to provide additional behavior and tooling to the existing tool. But this requires to build some plugins and deploy them in your environment.