Clarisse automatically imports shading groups if they were correctly exported. So if you are in Maya, make sure to tick "Export Material" when you export an obj and make sure to tick "Write Face Sets" if you export an alembic. If you work on another package you can have some hints on the discord server :
https://discord.gg/he8QTvDThen in Clarisse, you will access the shading groups of the selected object in the material linker widget.

Cheers