I did something similar for my daily calendar. I don't have a writeup of the actual device, but here's the firmware that generates the calendar image:

https://github.com/skorokithakis/calumny

It's a really fun project, but I wish these Waveshare displays had more open firmware. I didn't really manage to get the ESP32 to talk to the display (or even to connect to it, as I don't have the right adapter), so I used their sample code with its weird API and I'm sending an image straight to the ESP32, rather than have the ESP32 pull it from an HTTP server, as I wanted.