How can I assign "selectionMode" only to leaves in a PrimeNG tree?

I have two categories with variable subcategories which have variable sub-subcategories. I want to be able to only select the sub-subcategories, nothing else.

p-tree
[value]="treeItems"
selectionMode="single"
[(selection)]="selectedIndicator"
(onNodeSelect)="nodeSelect()"
>
</p-tree>


I tried finding if a class is added to the leaves, but I couldn't figure it out.

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