@jnmy That is a very interesting question, especially since many other lung diseases have a known exposure component. Not finding anything with a cursory search, I resorted to Google Scholar, using a variety of key words, and the only totally on-point study I found as a relatively small one from Korea:
https://pmc.ncbi.nlm.nih.gov/articles/PMC7723591/
Their conclusion seemed to be that occupation was less of an indicator than most other factors.

Anecdotally, my former ID doc and pulmonologist told me that in their experience the occupation or activity that presented to them often was gardener/florist - citing constant close contact with NTM infected soils, peat and their airborne particles. That made a lot of sense to me as my infection by M. Avium seemed to stem from prolonged exposure to soils contaminated by feral chickens and wild birds. But we still don't know which came first, Bronchiectasis or infection.

This certainly would be an interesting research topic, but I don't think primary providers encounter either bronchiectasis or NTM often enough that it would ever become part of a diagnostic checklist for them. Mine was preliminarily diagnosed by a sharp-eyed radiologist when I had a lung x-ray for pneumonia - several years after my symptoms began.