I do not think it can be done.
You could have a colleague with this distribution list or series of contacts send you a .pst with them. Then you could import this into your Outlook
You may not be able to send a .pst over your email. It would be easy to use a thumb drive or just rename the extension, send, then change back for import.
Otherwise, I think the easiest and arguably second most painful way would be to go through individually, right-click, and Add to Outlook Contacts (or just right click and hit ‘N’).
If you have the addresses in a spreadsheet: