how to install gcc-12 on ubuntu

$ sudo apt search gcc-12Sorting... DoneFull Text Search... Done$ uname -aLinux Han 5.10.81.1-microsoft-standard-WSL2 #1 SMP Mon Nov 22 18:52:15 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

I am using the default sources.list file, I want to install gcc-12 but I can't find it in the mirror source, what should I do!