I would also like to add custom data presentation in the output panel (via Dumps).

Becasue the output is rendered in HTML I would like to create a Plugin which will render JSON strings formatted with highlighting etc. for example.

Or I would like to fetch some data from other Places and attach it to the dumped data etc.

These plugins don't need to be a separate DLL. A Linpad script which implements a special interface would be enough.

Best regards
Christian