@oasixm Hi, welcome to the Displays section of the forum!
I assume you have already read How to get the best out of this forum, or a corresponding post in the French section.
In the Displays section, we appreciate if you post a link to the devices in question, so any reader or responder knows exactly what you are referring to.
Yes, your display is supported by GxEPD2, as an addition to the more common b/w and 3-color e-paper displays.
You should start with the example GxEPD2_Example.
In file GxEPD2_display_selection_new_style.h you would uncomment line 19 instead of line 17 for the 7-color display class, and uncomment line 70 for the driver class for your display.
Compile for your ESP32, and it should work. Ask again with more details if it doesn't.
Then look into the example to see specifics for your display.
Jean-Marc