https://projects-raspberry.com/trufflebot-sniffs-out-and-accurately-identifies-specific-chemical-odors/
There's a paper that mentions using VOCs to detect bed bugs:
https://pmc.ncbi.nlm.nih.gov/articles/PMC10048870/
I think someone tried to do this in 2011, but it didn't seem to take off. A large market exists, so possibly a profitable venture? I don't have the skills or abilities myself.