Please consider that a fasta file does not include general/proper/standard annotations.
A fasta file is only a name and sequence. Some people encode annotations in the name in non-standard way sometimes, but as such, programs cannot rely on them. Normally a fasta file can be accompanied by GFF file that annotates somehow a fasta file. But this is an external file.
Genbank files for example includes both the sequences and the annotations, on the other hand.
I am not sure about what you are looking for. Can you provide a link or an image of an example of what you want to do? for example if you have seen what you want in some published article that we can see?