Just to clarify – you want Anki to auto-play all of the audio files you have in the “TTS” field, but none of the audio files in the “eg” field? But presumably you want to have play buttons for all of the files, so that you can manually play/replay the ones you choose?
I know there are methods to play only the first audio, but I think it is literally just one file, and not all of the files in the first field. Perhaps some of these can be modified?