Is it possible to export/import ssh hosts from SQL Developer? The hosts are listed under C:\Users\name\AppData\Roaming\SQL Developer\system126.96.36.1995.2349\o.sqldeveloper.ssh but I don't find a way to export/import them into a SQL Developer.
No way that I have seen or found. I also pinged Jeff Smith and Kris Rice (Product Owner and Developer for the platform) on Twitter and they confirmed as well. (see https://twitter.com/thatjeffsmith/status/1125396802423992322)
On the plus side: You have located the configuration file. And, while not ideal, at least you can make your configurations somewhat portable. :-)