Custom application in Dashboard in Cockpit

I haven’t done it but I’d say it is possible.
Here’s some info:

For a simple button to Open the app, something like nethserver-roundcubemail code (*.json, api/read) could be of help, alongside of nethsrver-cockpit-empty.
Someone fro dev_team will be able to assist in greater detail.

EDIT: here’s another post which can suit you better:

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