Hi! If I understand this correctly, your goal is to just be able to play the multiple audio files, right? At the moment, you can only have one native audio block per UI because the interface always reads from the audio key.
However, one option would be to use a native HTML audio player with html blocks instead and provide an HTML template on each block that reads from a different variable in the task:
"html_template": '<audio controls><source src="{{audio1}}" /></audio>'
In your data, you could then do stuff like:
{"audio1": "base64/url here", "audio2": "base64/url here", ...}