Loader grouping assets under a parent asset

I have some assets I’m trying to group in the loader ui.
If I have the hierarchy use the parent field to do the grouping any assets where the field is blank no longer show up.

Can I have those assets just use themselves automatically if its blank or do I need to set all of the entities to list themselves as their own parent to get them to show up?

- caption: Assets
    entity_type: Asset
    - [project, is, "{context.project}"]
    - ["sg_status_list", "is_not", 'omt']
    hierarchy: [sg_parent_asset, code]