Thank you for the question. We have reviewed this post here along with the other post referencing ACS.
So, for the suggestion, there is not a clean answer to do this quickly from an existing sample on HoloLens.
For further discussion, you can open a support ticket with Microsoft so we can discuss it directly and help advise further. Here is how to open the support ticket:
aka.ms/HLSupport
When opening the ticket, you can select "HoloLens App Development (HoloLens 2)" for the product version and can select "API" for the category.
Thanks,
Nathan Manis
Microsoft Developer Support - HoloLens & Mixed Reality Services