Can audio player take its assets source as a variable?

The audio player can take two types of sources; Network or Assets.

If you select Network, you can configure the url as a variable, but if you select Assets you can only select one file you have already uploaded to the project.

Now, I have uploaded multiple files named like: 1.mp3, 2.mp3, 3.mp3, ..... & I want to change the source file each time the user click on a button. How can I make the source file as a variable that take a new value each time?