Magic is a fae and fickle study, and to manifest it's powers takes one oft years of study.
There are however, several ways around this.
One of the most common is Aether slimes. These unusual variants of the family of species are distinctive for their ability to give off magical effects. They can grow from the size of two fists, to in some cases, three feet across.
It's unknown how it was first discovered, but after being salted with an array of alchemical compounds, the creature grows dormant and can be absorbed into the skin in a brief, but highly uncomfortable process, where it will re-converge, keratinize to a degree, and remain dormant.
Through surgery, this can be properly managed into sizable implants on a woman's body, where they will still ceaselessly cultivate magical power, able to be channeled and unleashed by the bearer.
Some variants are known to exist, that may give select magical or physical states. Float slimes are particularly popular among those alternatives, as otherwise the weight of such implants, being otherwise slightly lighter then water, is known to be exhaustive to adapt to.
Such practices are viewed with mixed results. Some societies may look upon women who have undergone such proceedings with admiration, in respect to their resource, drive, and magical/social power. Others may look upon them with derision, seeing a woman who, in her desperation for fast, quick and easy power, made her body into a gauche and overburdened, clumsy parody of female sexuality.
Ngl, kinda want to stat these now.