SASS (not SCSS) Emmet completions doesn't appear or expand in VS Code or NVim

[braindefender]

Describe the bug
Emmet completions doesn't appear or expand (via Tab or Expand Abbreviation command) in both VS Code and NVim.
Only syntax highlighting works.

Emmet abbreviations work in CSS, SCSS (lang="scss") and PostCSS (lang="postcss") but do not work with sass.

To Reproduce
Make <style lang="sass"></style> scope.
Type any abbreviation (i.e. fz14 or df) and press Tab in VS Code.
Abbreviation doesn't expand and Ctrl+Space (show suggestions) also doesn't work.

System

• OS: Windows
• IDE: VSCode, NVim
• Plugin/Package: Svelte for VSCode, leafOfTree/vim-svelte-plugin

[dummdidumm]

We use the vscode-html-language-service for the CSS intellisense, and that service does not support SASS unfortunately.

[braindefender]

We use the vscode-html-language-service for the CSS intellisense, and that service does not support SASS unfortunately.

Any possibility to use something (as fallback, maybe) that Vetur use?

[dummdidumm]

While the language service does not support sass, luckily the emmet helper does, so emmet completions can be added.