[DesertVarnish]

At one point, Roam supported importing org-mode files (my team actually asked them to implement it back in spring of 2018). The product vision has changed a lot since then and I'm not sure if they still support it, but if there's interest I wouldn't be surprised if they brought it back.

[conaws]

You can import any plain text or markdown file into Roam -- we take the indentation structure and parse it out.

Can also copy/paste in any html

Would build a special emacs importer if there was strong need -- but emacs export is so powerful you can also just export org-files into a format that Roam accepts already