How to edit squareline's LVGL source files to add USER1 keyboard layout?

Was wondering how, if possible, to edit the LVGL files that squareline uses in it’s own UI to reflect changes made, specifically a custom keyboard layout.

I’ve added a custom keyboard in the LVGL folder that’s in my project files, but when I select USER1 for the keyboard mode it shows a default TEXT LOWER keyboard. It will put lv_keyboard_set_mode(ui_Keyboard1,LV_KEYBOARD_MODE_USER_1); when I export the UI files, and is the correct layout for my custom keyboard. I’d just like it to reflect the customization in squareline.

I can live with it not looking correct in squareline, but would be nice if I could get it changed.

thanks