Grafana - using variables in the "Message" field of Email and other contacts

How can I figure out if I’m using (by default) legacy or unified alerting in grafana-server 8.3.3 ? I think I’m a bit confused about all this. E,g. I can create a named template in “Contact points” -> Message Template, but I see no way of referring to that named template in an Email contact point configuration. I expected a dropdown menu or something with named templates.