Ok. It took some research, but I think I have it worked out. You have to either be using the gboard keyboard or go to the emoji kitchen website. From the website, you can just combine, copy, and paste. From Gboard, you need to select the smiley face next to the space bar OR click the 4 squares and then go into "emoji." From there, you can select 2 emojis (assuming they are compatible) to create a new emoji, or select 1 and choose one of the recommendations. I can't get it to work from my phone in the Voyager app, but I also can't guarantee that's Voyager's problem vs. mine. It does work on my texting app, however, so I know it works. For further reference.

Ding Ding, check this comment chain for your answer. Today you, tomorrow me.