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Putty, Moba, etc. usually have Session dialogs to save this stuff: https://puttysm.sourceforge.io/images/psm-folders.jpg

Isn’t git bash and its ssh config file equivalent to that on *nix systems?

Yeah, the git bash environment or even WSL Bash if you can get it on your machine will give you the ability to use the OpenSSH config file.

mRemoteNG is very good for many remote sessions.

+1 for mRemoteNG (although it uses Putty for SSH), but it supports a lot more: RDP, VNC, Telnet, raw sockets.