There are transcripts in some podcasts. Try looking at the RSS feed for Podnews Daily - in your service as https://pods.ee/261 (look at today's, Oct 19, since there was a bug generating the SRT/TXT versions recently).

You'll find transcripts for some shows in SRT format, and some have JSON and TXT as well.

Use those transcripts if they exist, I reckon!

Also, check podcastindex.org for an alternative search API; and join podcastindex.social to learn more about the various tools.