We recently introduced handlebars support for templates but unfortunately we don't currently support variable substitution in frontmatter I believe. (Correct me if I'm wrong @kevins8) You can however create a custom note trait and specify an

OnCreate

behavior to set the title. You can write plain javascript to customize what the note title will be on creation with note traits. See: https://wiki.dendron.so/notes/bdZhT3nF8Yz3WDzKp7hqh/