Not able to get lit-html highlights in typescript+lit based project

[Rajdeepc]

Description of Bug

Not able to get lit-html highlights in typescript+lit based project

Steps to Reproduce

1. Go to https://stackblitz.com/edit/vitejs-vite-2ilo6nmh?file=package.json,src%2Fmy-element.ts,index.html
2. See no highlights on lit under html`` in render method

Expected Behavior

Should highlight lit-html syntax how VS Code highlights

Screenshots/Screencast

Should look like this

Now it looks like this