I have an online AnyConnect profile editor you can use.
https://ifm.net.nz/cookbooks/online-anyconnect-profile-editor.html
For Windows, this needs to go into this directory:
%ProgramData%\Cisco\Cisco Secure Client\VPN\Profile
If you are deploying AnyConnect using IntuneWin, you can also place the profile in this directory, and it will be deployed automatically at install time.

If you are prepared to do a bit of setup work, you can also use the Cisco SecureClient cloud management portal. The client pulls all of its configs from that (it also lets you push client updates easily).
https://secure-client.apjc.security.cisco.com/