@lucky FYI: I have deleted the posting by Spinebot, which listed outdated 4.2-beta UPM package download links. Please never use old beta packages when non-beta 4.2 packages exist.

lucky As a wishlist item ,it would be cool if one could reverse engineer binary or json export settings, such as fetching the scale size, if premultiply alpha is on, edge padding etc then we could reverse engineer already exported files faster than guessing at settings(specifically with scale and white space + premultiply alpha).

In case you didn't already notice, the exported .atlas.txt files already contain PMA and scale info, like
pma: true
scale: 0.5