I have long reads from transcripts sequencing ( one amplicon sequenced wtih PACBIO ) that I mapped to a gene locus using minimap2. I would like to extract transcript structure ( in GTF format ? ) with their abundance. For example, in the screenshot bellow, you can see an alignment showing 2 kind of transcripts. One, with an intronic retention. I would like to get the structure of those transcripts and the amount .