I made an add-on that exposes a list of user defined home assistant sensor states in a simple HTML table for Poly (Polycom) VVX phones to display using their microbrowser.
I made this for my Polycom VVX 500.
Some more details in this post Home Assistant Dashboard on Polycom VVX - wtip.net with links to the repository.
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Makes you remember when everything on the www was simple html.
If you’re not on HAOS, here’s a link to the python flask app elements that worked for me. Put base.html in the templates directory for the main app to work with it.