Hi Andre,
You would require an external resource/class to accomplish this currently. Here is a PHP example but for mobile apps I believe you would require a JS library similar to the following:
I do not believe this would be possible right now, not out of the box so to speak. You would have to investigate alternative options.
Yes Wappler can do this for you. Wappler can serve/scale the images based upon device screen size. There are many guides on how this can be achieved in the documentation.