How to send body and multiple images to a rest API

I’m building a phone app with ionic, and I have a photo array that the user takes or loads from the gallery, like this: =>  {
      this.imagen = imagePath;

Now, I want that when I do the post to the server, which is a rest API in nodeJS, I can send the body and the images array in the same petition. I’ve been trying to do it with FileTransfer, but I can only send the images one by one, and I can’t send a body with them. Does anyone know how this could be achieved? Thanks!

make an array of images in the form of base64. then pass it in post data in API call.