Yes, you are able to edit any word said in a podcast, including interjections.
Once the episode transcript is generated, you can click into any part of the transcript to begin editing.
Feel free to edit it like a word document.
Important things to note:
You can edit which host is speaking by using the dropdown.
Pressing "Enter" at the end of a speech block will create a new speech block.
Adding [ and ] around text will turn it into an interjection.
After you review the transcript, audio generation is the next step. This step will cost credits, so make sure you're happy with the transcript.