I am using sc.pl.heatmap and sc.pl.rank_genes_groups_heatmap to generate figures. However, the number of clusters in my data is more than 20. I think the number of predefined colors in the plotting function is limited to 20. So the last 4 (from the cluster 19 to 22) clusters have the same color. I was wondering if there is any way I can change the color or use different colormaps for the group bar.