Hi ! It will be great to support Xiaomi redmi k20 Pro known in europe as Mi 9T Pro, Not Xiaomi redmi k20 or Mi 9T. Xiaomi redmi k20 Pro / Mi9T Pro are called raphael whereas Xiaomi redmi k20 / Mi9T are called davinci.
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Hi, @chaizijun welcome to the /e/ forum.
Are you aware there is an [Unofficial Build] Xiaomi Redmi K20 Pro Mi9T Pro raphael e-OS Q-build. The more people who test test it and can give constructive feedback, the more chance of it becoming a supported device. 
Hi,
Does this rom not too old?
Is there a maintenance with it or not ?
this one is a bit more recent ( UI improvements )
e-0.17-q-20210522-UNOFFICIAL-raphael.zip | by itsclarence for /e/OS supported models
Hi,
I installed this ROM onnmy device Raphaël.
It works very well but i have some questions.
Does security patchs are still regulary update?
Do you think there will ne a ROM for A11 or better for Android 12 for Raphaël devices un thé futur?
Thanks ans congratulation for tour vert good job.