Hello sir!
I tried to solve the problem using the Blob solution you suggested but it didn't work, Therefore, I changed the way to solve the problem; instead I opted to just pass the image coordinates to the server for cropping (via ImageMagick) - That worked, But I had to use a different plugin to have access to that functionality.
There's a huge needed within the Ionic community to have a crop plugin that works out of the box with minimal effort; I hope you keep working on yours and make this happen, would be amazingly cool!
-J