EDIT

  @Hank21 I dont know how many people use Google DDNS services, I for one do and would love to be able to bind my ssl to my tp-link router, but I would also have to agree that some Universal option might be a better option than just certain DDNS providers

+1, Google DDNS uses DynDNS, so this shouldn't be a hard request.  

FYI on Unifi if you choose "Custom" and just type in "domains.google.com", it works fine.

  @Draotth 

I'll +1 this and also request Cloudflare and Namecheap

It looks like this might have been implemented in Omada SDN v5.8. However, I can't quite get it working. If I go to settings and select dynamic DNS under the services tab, I have the option to set the service provider to "Custom". Once I do that, I can then set the username and password to the one generated by Google Domains. The update URL should be https://[USERNAME]:[PASSWORD]@domains.google.com/nic/update?hostname=[DOMAIN]&myip=[IP] . However, despite doing all of this the DNS is not updating and I can't find any error logs.