I’ve have the LittlevGL ecamples working on an ESP32 device using Mongoose Os if anyone is interested. This is available at https://github.com/pjaos/mgos_esp32_littlevgl.
I’ve also put together a template project using LittlevGL that can by used to configure the WiFi interface on an ESP32 device. This is available at https://github.com/pjaos/mgos_esp32_littlevgl_wifi_setup.
Hope it’s useful to someone.