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Assist Widget
(midwest.social)
Home Assistant is open source home automation that puts local control and privacy first. Powered by a worldwide community of tinkerers and DIY enthusiasts. Perfect to run on a Raspberry Pi or a local server. Available for free at home-assistant.io
I just tried and I think they are limitations on numerous android OS.
It isn't exactly a widget but what I have been able to do is create a shortcut when long pressing home assistant app icon on my phone
To do so, go to home assistant app settings/compagnon app/shortcut Give it a name and description, not too short according to documentation (see below), next add under dahsboard
https://companion.home-assistant.io/docs/integrations/android-shortcuts/
Edit: added another screenshot from settings (sorry in french but that should help). This was just a quick test, this is why I named it assist_widget. You can also change icon type
That did the trick.