Paging mp3/wav files through nodered

Hello, using FreePBX 17.0.19.23 & Node-RED v4.0.8

I have created a simple flow in nodered for triggering a paging group and it works flawlessly (by following this tutorial by sangoma: https://youtu.be/i_KFRF_avsE?si=Te6fbvXTBCaNY2nD ) .

Now id like to create a system for injecting my own mp3/wav files through nodered that the paging group wuld play as a alert tone. How to achieve this function? Im trying to research more on this theme but the only thinig i found till now was the sangoma tutorial. I think it has to do something with http? I already have a directory with my soundfiles streamed at a http server so I wont mind. If anyone has an idea on how to acomplish this im all ears.

Thanks for anything, Adam Roth