Reply from @fkardame
The barcode are sent directly to the printer using print format and not as image.
Using jinja(for pulling items and quantity in row) html(for text and alignments), js(for barcode using SVG) and css (for print media size - can decide the barcode label size ) we are using 1.5inch width *1inch
Created a “barcode label” print format in purchase receipt and material receipt.
So after submission they can just print and select barcode label and print the barcodes in zebra printer from the browser. But not too forget to remove the margin as default and replace is by none and also disable header and footer from print setting in the browser or else it will print the url also.
Hope this will help users in retail business.