Possible to enforce the type of a template @Input() parameter?

[ThorstenKunz]

Is it possible somehow enforce that a parameter to an @Input binding in of template is of type TemplateRef and nothing else?
The component is a blackbox but it defines @Input xzy: string | TemplateRef;. Now if the parameter is a string the component is using some "innerHTML" assignments - which we really want to avoid so I only want to allow that it binds to TemplateRef types in our app.

Thanks

[JamesHenry]

Yes, you would write a custom rule which leverages the TypeScript compiler's type checking APIs:

https://typescript-eslint.io/developers/custom-rules#typed-rules

You can also leverage some of the existing utilities from @angular-eslint/utils in your rule implementation