Subdomains based localization

Hello.
I have main domain.com and its subdomains en.domain.com, fr.domain.com, de.domain.com and others.
I need to build localization versions of main domain on subdomains. How can i do it?

There are only 2 codeigniter 4 official ways in docs:
1) https://codeigniter4.github.io/userguide...egotiation
2) https://codeigniter4.github.io/userguide...#in-routes

The first method has nothing to do with subdomains. The second method based on zero uri segment and it's also not my case.