Need help - how to save all emails in a folder

I'm trying to figure out how to save a batch of emails, after I sort various emails into various folders. Assume I have all emails I sent to Smith, in a specific year, moved to folders with names like SMITH-SENT-2022, SMITH-SENT-2023, etc, and all emails I received from Smith in a separate set, sorted by year. Can I transfer all of the emails in any single specific folder, to some sort of file I can work with, either in EML code (for Outlook), or as pdf, txt, doc, or any other common format. And, can I keep the readable non-encrypted names of those emails as they are, when I open the Proton email program and read them? BTW, I downloaded and tried the "Export" tool, but I could only get a set of over 1000 EML files, totally unsorted, with encrypted names that give me no clue re: what is in any specific file.