For Visio for the Web, make the Visio JavaScript API also available when Visio files are stored in a third party database.

At the moment we can use the Visio JavaScript API to interact with shapes of the diagram presented in Visio for the web. (https://docs.microsoft.com/en-us/office/dev/add-ins/reference/overview/visio-javascript-reference-overview)
But for this to work the Visio files needs to be stored in SharePoint or OneDrive.

When you have implemented the WOPI protocol you are able to view documents using Visio online that are stored in a third party database (https://wopi.readthedocs.io/en/latest/).
We are in need of the Visio JavaScript API to allow shape interaction also working when we use a third party database.