Table Generator Question

After using the Bootstrap 4 Table Generator – which worked perfectly – I can’t seem to figure out how to merge two table columns to one. See below (please note that I removed the angle brackets):

td dmx-text=“audio_speaker_first_name” /td
td dmx-text=“audio_speaker_last_name” /td

What I would rather as an output is something like:
td dmx-text=“audio_speaker_first_name audio_speaker_last_name” /td

Everything I’ve tried fails.

Any suggestions are appreciated!