Possible to add MAME cores to Lakka?

Hi! I the build of Lakka I have on my RP4, I have two options for MAME cores: MAME 2010 and MAME 2003. Is there a way to add additional MAME cores to Lakka? I did some searching and found a thread from 2016 that said no, but that was a while ago and wanted to know if that was still accurate. Thanks!