Actually, you can.
As Andre points out, now you can do this in the workspace settings.Go to Visual Studio Code Settings: File >> Preferences >> User Settings
// Place your settings in this file to overwrite the default settings
{
// Configure file associations to languages (e.g. "*.extension": "html"). These have precedence over the default associations of the languages installed.
"files.associations": {"*.ejs": "html"}
}Click on the ‘Plain text’ tab at the bottom of the VS Code window and change it to HTML, screenshot below:
