Angular Recursive Component

recursive-tree.html

<!-- Input -->
<tree [tree]="tree">
  <template tree-render let-node>
    <h1>{{node.label}}</h1>
  </template>
</tree>

<!-- Output -->
<div class="tree">
  <div *ngFor="let node of tree">
     <template
            [ngTemplateOutlet]="treeRenderTemplateRef"
            [ngOutletContext]="{ node: node }"
     ></template>
    
    <div *ngIf="node.children && node.children.length">
      <tree [tree]="node.children">
          <!--I need the template here. how do I accomplish this?-->
      </tree>
    </div>
  </div>
</div