How should I go about handling nonuniformed sprite sheet with JSON data?

Question

This might be a lenghty question so bare with me.

I'm developing a 2D game i Monogame framework and I'm stuck with it comes to handle large sprite sheets with different frame width, height and animation. I want to load a sprite sheet that has different animation.

Like this one

Taken from this question

Some frames in this sprite sheet have different width and height, meaning that I can't use a uniform split with spritesheets width / amount of columns because it will not work with all the frames. I have used a tool that gives me cordinates in JSON format like this

{
   "@imagePath": "sprites.png",
   "SubTexture": [
      {
         "@name": "spriteframe1.png",
         "@x": "862",
         "@y": "0",
         "@width": "112",
         "@height": "120"
      },
      {
         "@name": "spriteframe10.png",
         "@x": "0",
         "@y": "320",
         "@width": "252",
         "@height": "156"
      }
}

But here I have problem understanding how I should handle these different frames. How can I switch between animation frames and make sure that the animation loops with state of the object?

E.G If the object in this case flies, I want to loop trough the wing animation but how should I handle it so that only the "Fly-frames" are being looped?

At the moment I have all the frames in a list where every element is a frame with its own x,y,width and height metadata.