RH 2020 - Can you use Map Ids created in Classic RH if you import those topics to RH 2020?

We have a RH 2020 project. Most of the content is topics that were created in Framemaker, imported to RH Classic. The imported content contained map IDs that now show up as bookmarks. If I try to show a report of map IDs there are none. If I export a map file it is empty. Is there any way to use our existing map IDs in our new RH 2020 help project? Can I import the map file from the classic RH project to the RH 2020 project? 

Thank you very much for your help.