Hello,
I still didn’t tried it but I hope won’t be much of a hassle to port it.
Anyways there a pull request made in the original repository and I’m not sure if this proposal will be ever accepted to be part of official LVGL.
By the way if you use this and you like it, give it a try and make a small list of what needs to be changed so it works on the new LVGL version.

Are you still interested in trying this with epaper? Days ago I made some tests with a 9.7” display and epdiy V7
https://x.com/martinfasani/status/1694079978315411560

@lanistor can you try to clone this repository using branch lvgl-83
https://github.com/martinberlin/lv_port_esp32-epaper/tree/12/lvgl-83 (And updating all submodules to latest stand)

 git submodule update --recursive --remote

Only thing pending is to correct examples since they need some minor alterations so they compile in ESP-IDF 5.1

I had changed to compatible with v8, using esp-idf 4.4: https://github.com/flickerlist/lvgl_epaper_drivers/tree/release/monochrome