Mark spliced/unspliced reads on original BAM file

[taffy-miao]

Hi Team, Thanks for the package. I wonder can velocyto mark spliced/unspliced reads on the original BAM file or the sorted file? If not, I want to use pysam to add customed tag to identify spliced/unspliced/ambiguous reads in the counting process, which file and where should I edit? Thanks for your help