Is there a way to pass in handle bars templates directly to trigger email?

[joshpetit]

I was wondering if it's possible to pass handle bar templates directly to trigger email. I see you're able to reference templates in firestore with this syntax:

    template: {
      name: "following",
      data: {
        username: "ada",
        name: "Ada Lovelace",
        imagePath: "https://example.com/path/to/file/image-name.jpg"
      },
    },

But I was wondering if it would be possible to do it like this:

admin.firestore().collection('mail').add({
  to: 'someone@example.com',
  message: {
    subject: 'Hello from Firebase!',
    html: 'This is an <code>{username}</code> email body.',
    data: {
       username: 'name',
    }
  },
})

The alternative would be just to install handlebars and create html strings manually to pass in, but if it's already possible or easily exposable through the trigger email API that'd be awesome!