Importing anchors from a text file

Hi,
I am working on updating/revising an old font file (Arabic script).

The only anchors data I have available (for top and bottom mark positioning), is a text file which is essentially the _ mark _ feature in AFDKO format.

Is there a way to use the data from this text file to import the anchors coordinates into the associated glyphs in my Glyphs file?

Thanks,

Patrick