Export animated waveform
Export audio as video with animated waveform
You can also export audio as video with an animated waveform, choose a waveform style and color.
Here's some example of the available waveforms styles
To add captions to the automated waveform, at the moment, the exported mp4 could be combined with captions, by exporting plain text option from this app, and using subtitlesComposer-app to create a caption file.
Then you could then either use an editing software of choice to bring the two together, or the experimental captions burner app.