Hi, if you can output png sequences - and they look like the example you posted - what is it that you would like to see in them that you are unable to achieve now through them? Do you want all the animations in a single spritesheet? do you need them to be all of the same sizes? Or by image sequences you mean you exported the single frames and you want them all in one spritesheet?
I recommend you to read the settings here: Texture Packing - Spine User Guide and here: Export - Spine User Guide
But in case it's the last scenario, make sure your settings look like this in the red squares (except for the FPS, which you can set to match your animation's frame rate):
and then in the atlas settings, make sure Grid is checked:
