If anyone was wondering: https://www.tcl.com/us/en/products/mobile/tcl-tab/nxtpaper-11-gen2
11 inch display with 60 hz refresh, but it sounds like regular lcd rather than e-ink? It has an 8000mah battery that it says can run the tablet through a full day, so that's nothing like an epaper tablet. It sounds more like a drawing tablet, as it has a pressure sensitive pen.
Anyway, I've been using Librera FD for reading epubs on Android. Its blurb mentions annotations but I've never tried that feature.
I have an Inkplate 10 e-paper tablet but haven't been using it.