The FTC home page has a list of options, including “file antitrust complaint.” I’m guessing that’s probably the most useful: https://www.ftc.gov/ I’ve also seen others say to email antitrust@ftc.com.

But here is the FTC contact page: https://www.ftc.gov/about-ftc/contact. And here is more generic agency information: https://www.usa.gov/agencies/federal-trade-commission

Contacting most government institutions is usually surprisingly easy and you typically don’t need to be overly concerned about using the right template or anything.

Just quickly and clearly communicate what topic it’s about, what your specific issue is, a small bit of reasoning showing why it’s a problem, and a brief conclusion that usually asks for a specific action.

You can always call the general phone number and very briefly explain in laymen’s terms what you need (maybe something g like “I’d like to submit comment about a specific technology” or something similar). The operators are usually willing to help get you in touch with the right person, as long as you can explain what you need in a succinct manner (unlike this ridiculously long comment).