Unfortunately TheC64 Mini probably isn't a powerful enough system to emulate a SuperCPU. The full-sized system might be. However, it is unlikely that there will be an official SCPU firmware upgrade or update as Retro Games Limited will probably not want to pay to licence it.
Is this available on the 64 Maxi? I see they are D81 files and these can be played on a normal 64 but that doesn't have the power. Just been reviewed in Zzap64! micro 2023