It's possible to take a template as @Input for a component to customize the render

@Component({
      template: `
        <nav>
          <ng-container *ngTemplateOutlet="template"></ng-container>
        </nav>
      `,
    })
    export class SiteMenuComponent  {
      @Input() template: TemplateRef<any>;
    }
    

<site-menu [template]="menu1"></site-menu>
    
    <ng-template #menu1>
      <div><a href="#">item1</a></div>
      <div><a href="#">item2</a></div>
    </ng-template>
    

Note: ng-content should be used for most of the cases and it's simpler and more declarative.
Only use this approach if you need extra flexibility that can't be achieved with ng-content.

Links

• https://blog.angular-university.io/angular-ng-template-ng-container-ngtemplateoutlet