[Koha] Replace all existing call numbers with LoC

Hi, I'm working on a restructuring of a small arts non-profit library. The library currently uses an esoteric, confusing custom catalog numbering system devised by a staff member who is no longer here. We'd like to switch all our records over to LoC cataloging. We currently are using Koha 3.18.05.100 - I'm curious if it's possible to replace all our records with LoC records, in bulk, rather than editing each individually. Thanks!