Printing png file using Epson ESC/POS

Hi there,

Is there anyone who knows how to print a png file (or jpeg) on an Epson receipt printer TM-T88V using ESC/POS commands ?

Documentation says using 'GS ( L’ or 'GS 8 L’ commands but doesn’t give much details about the formatting of the ‘raster/binary’ data, sizing, etc.
Googling the web and forums gave a lot of questions but no real answers.

The png can not be pre-loaded into the printer, it must be loaded dynamically every time it’s printed.

Thanks !