Great tool! Are you able to export a JSON format like https://sanderfrenken.github.io/Universal-LPC-Spritesheet-Character-Generator/
Reason is that I like to use https://github.com/DrJamgo/Godot_LPC_Spritesheet_Gen/tree/main/addons/lpc_sprite...
which needs that JSON input to work as intended.
Is your tool open source? Then I might take a look how to do it.