What is the best way to create personalized messages?

So i'm experimenting with the messaging api and I want to create personalized emails not to advanced I just want to say "Dear ," ... you know stuff like that. But I don't see a feature that enables me to do that. does anyone know a of another way to do this so I can use the topics feature instead of having to create a new message for every user?

See if this helps - https://dev.to/appwrite/sending-a-custom-welcome-email-using-appwrite-functions-and-mailgun-225a

sadly this does not use the messaging api from appwrite itself.