The Angular Language Service doesn't work in *.tns.html templates

[sis0k0]

Environment
Angular 8.2
NativeScript 6.0.3
@nativescript/schematics: 0.7.1

Describe the bug
The Angular Language Service doesn't work in *.tns.html files.

To Reproduce
Try any of the Angular Language Service features in a platform-specific markup file.