[Mi Browser] How-To enable cross-origin isolation

[devtty]

I develop a web app that needs cross-origin isolation, but I don't find a way to enable it on Mi Browser.

I follow guides to enable cross-origin isolation, like this one, setting headers COEP to 'require-corp', COOP to 'same-origin' and CORP to 'same-origin', but without success on Mi Browser.
I also set Content-Security-Policy header to "default-src 'self'; script-src 'self'; child-src 'self';" to increase security.

How can I enable cross-origin isolation on Mi Browser?
Mi Browser need specific headers to enable it?

I hope that you can help me.