How about Upnote or Zoho Notes.
this post was submitted on 26 Nov 2023
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F-Droid
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F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
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are they foss?
Nope
Notesnook? though I'm not sure about the collaborative features. You can password or fingerprint secure notes though. There is a free and paid tier so you'd have to test to see if the free tier does what you want. I'm on their paid plan due to a sale ($25/yr), so can't remember which features are behind the paywall or not.