Feature request: defining ground truths

[semenko]

Thanks so much for this incredible work!

I'd love to see (if you're adding features), options to define ground ground truths based on known marker genes, outside just file_known_markers — or perhaps an option to derive file_known_markers from celldex?

I'm currently using Seurat v4 Azimuth (which unfortunately only has a few good reference databases available) and/or singleR, which has a nice workbook.