I think the "Trained" patch goes a long way in that regard. Even though in reality it doesn't take a heck of a lot of time or experience to get a Trained patch. But to parents who don't know anything about it, it's pretty self-explanatory.
They may not know what service stars mean. And having a trained patch for some may not mean much since they were recruited as a leader with their Cub and know they have to do online training only.
When I was looking for Scout troops many years back, experience and training was one of my questions of each troop.
Fast forward many years later when I became an SM, and one of the things we provide to the visiting parents is a detailed summary of each's leaders' training and years of service. This has helped us a great deal in recruiting because we require all SMs to have the usual (YPT, IOLS, Lader-specific) training, but also require all the other online courses (x Safely, weather, etc.), and CPR/AED. We make sure we have at least 4-6 valid WRFA and ARC first aid trained folks too, which we often exceed. Since we do shooting sports we have 4-5 NRA and USA Archery trained folks as well. To top it off, we have the JASMs and many of the older Scouts take much of this training too Let's face it, it's easy and it helps show commitment to safety.