Yes, I have "persistent pubertal gynecomastia." I developed it as a young teen. Had glandular tissue just beneath the nipples. At times I even experienced galactorrhea.
If you start even low dose estradiol, you may "jump start" the process, as you naturally have a head start.
In my case, I had A-cup moobs for nearly 40 years, then they exploded so quickly (in just under six months) with estradiol and T-blockers, it scared me. I easily fill a B-cup sized sports bra I have to wear exercising (due to the jouncing). My right breast is even a little bit bigger. The glandular tissue has expanded from the size of a half pecan under each nipple, to the size of a half golf ball.
If I go to a higher, normal dose, I think I could become very chesty.
There are several YouTube posters who talk about similar experiences. One, I recall, is named "Evolving Emily."
BTW, welcome to Susan's Place. Consider posting an introduction.