If you are not satisfied with the stock camera, you should try the google camera for your device if that is optimized. The stock cameras of Xiaomi Mi A2 Lite are quite tremendous and take decent pictures. Although the, there is a version of google that was optimized for Mi A2 Lite.
Yes, it does support the google camera. There is an optimized version of google camera for this phone; you need to download that and install that on your device. The google camera could be satisfied you if you’re not with the stock camera.