Unfortunately CLI won’t export a spritesheet per tag, as noted in How can I export multiple spritesheets at once?
UPDATE: I added a custom bash script to export one spritesheet per tag in the thread linked above
We need to go through multiple steps (e.g. export GIF → convert each GIF to spritesheet) or try some custom script (e.g. Sprite sheet exporter script with scaling (outputs .json and png) but does not support custom user fileformat, need to edit script manually for now)