Is there any way to provide an access to ContentChildren which are inside ng-template?
If you look at the example you see the issue - the routerLinkActive directive does not see any routerLink directives in the second row.
<div routerLinkActive="active">
<a routerLink="/hello">Hello</a> | <a routerLink="/blank">Blank</a>
</div>
<div routerLinkActive="active"> <!-- non-working RouterLinkActive -->
<ng-container *ngTemplateOutlet="menu"></ng-container>
</div>
<router-outlet></router-outlet>
<ng-template #menu>
<a routerLink="/hello">Hello</a> | <a routerLink="/blank">Blank</a>
</ng-template>
For understanding how the routerLinkActive directive works you can look at the code