Setting display folders

Thanks for your thoughts.
I do mean display folders like in your first link. It's possible to break the file into separate sources to create something like a display folder, but this wouldnt allow for nested folders & I'm also looking to edit other metadata (eg. the synonyms, data type, format, category, summarize... and so on)
So far i'm only aware of the drop-down / point&click methods as shown in the link you provided.
Do you know if there is any other way to edit the metadata, maybe in the source (eg. parquet),
or programmatically via Mquery/DAX?
I'm pretty sure there would be a way with an SSAS backend, but this project doesnt use that infrastructure.
I think the only other way to edit/set these fields is via TabularEditor, but i cant use that tool in this workplace and ideally I'm hoping it could be an edit i could make in script via R/Python/Mquery.
I feel like PBIXR comes close to acheiving this in R, but it hasnt been updated in a while and I'm not sure this metadata is available in the file even after decompression?