Easy way to annotate CDSs in GFF3 with HGNC gene symbol (and transcript name?)

Question

[gernophil]

As you know, there are some differences between GTF and GFF3 files. E.g. the stop codon is not part of the CDS in GTFs. Therefore the HGNC gene symbol (and transcript name) are attached to CDS features in GTFs, but not GFF3s. No I am looking for an annotation with stop codons and gene symbols. I made a Python script to add stop codons to CDS in GTFs, but it feels a little messy. Is there an easy way to annotate the CDS Features of GFFs with gene_symbol and transcript name?