How to show the downregulated marker genes by sc.pl.rank_genes_groups?

Hello Scanpy,
I’m wondering whether it is possible to show the downregulated marker genes by sc.pl.rank_genes_groups() or other functions, so that we can export the gene list for further GSEA analysis?
I know sc.pl.rank_genes_groups_dotplot can show the downregulated genes by change n_genes to negative numbers, but it didn’t work in sc.pl.rank_genes_groups().
Thanks!
Best,
YJ