'how to apply for a register to rootCA to the android platform

I just want to know that how to apply for a register to RootCA to the android platform.

for example, Amazone rootCA was registed on Android platform.

When I search on internet, I can't find that.

please tell me how to register RootCA on android. and I want to know that How to make a android platform.

url, text anything is okay~ please tell me.

android root

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