Select Field: Group Category options based on level of category

Hello, I would like to create a Select Field to display categories of products, but i want them to make sense visually like this:

  • Category 1-- SubCategory 1-1-- SubCategory 1-2
  • Category 2-- Sub Category 2-1-- Sub Category 2-2-- Sub Category 2-3
and so on..

Each Category has a parent_id, pointing to the parent category.
Any ideas ? I didn't see any reference in the docs

Thank you in advance!
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