No, ham bands are separate from the GMRS bands, so if you want transmit on the GMRS bands, you'll still need to pay the FCC for a license. I have both a GMRS license and an Extra Class amateur license so that I can adapt to whatever the group i'm riding with uses, i've never used my GMRS, /ever/, so the $85 license fee feels like a waste of money in hindsight.
If you know for sure that you are going to be with others using GMRS, with no other communication option, get the license. the costs is almost reasonable if you plan to actually use it all the time because it covers your whole household (spouse and kids) for 5 years. If you are not sure, save the money and spend it on getting a CB, a Baofeng HT and a ham license, that will likely cover everybody you run across. The Technician test is surprisingly easy to pass, especially if you don't care to learn the "fundamentals" just yet and just spend a few hours studying and remembering the exam questions. Check
https://hamstudy.org/, for example, you can use it to study the tests for free. Read through the questions and answers, then go through the flash cards, then start taking practice exams until you can reliably get 80-855. At that point you will be ready to easily pass the exam. This can be done in a matter of days only spending about an hour a day studying.