Yes you can. One vault at a time. Exporting other metadata apart from basic name, password, url is very clunky. Then you will also need to manually handle attachments for each entry. Some types of entries also have "special needs". Then sometimes there are errors. I've recently migrated from 1P and it was a lot of tedious manual work. It feels like the support for exporting data is kinda neglected, so I'm glad I did it while the feature is still there.
OTOH I've helped a relative to migrate from 1P to Bitwarden who had only a single vault for browser logins with name, password and url items and the process was quick and easy.
The thing I've hated from the day 1 and still can not forget is the reserving of the "type" keyword. Basically every module has these ugly "tp" or "typ" or "type_" structure members everywhere but type aliases are rarely seen in comparison.
OTOH I've helped a relative to migrate from 1P to Bitwarden who had only a single vault for browser logins with name, password and url items and the process was quick and easy.