Assuming this means importing from other bookmark services (e.g. delicious, pinboard, etc.)?

Yes this is on first import of the standard HTML bookmark structure used by Delicious etc.

This fundamental: I tried the product, but immediately canceled, cause i can’t migrate from browser’s bookmarks, if can’t import folder structure

I do not have 100 bookmarks. I do not have 1000 bookmarks. I have more, collected over years. They have an obviously indispensable folder structure.

Without an import honoring folder structure, I cannot use the import, and neither, therefore, Larder. Which would be a pity, since it feels so promising!

I just imported all my bookmarks from Firefox and… still no folder structure in 2022 :/