The idea is an artificial scaffold that supports the development of ovarian follicles, and it's worked in mice.
In human women, the idea would be to remove ovarian cells before, for example, cancer treatment, and then implant the "bioprosthetic" ovaries afterwards. The advantage over freezing eggs - it's possible for normal conception to occur.
In the long term, the ovarian cells could be developed from the person's own stem cells - allowing for normal pregnancy and childbirth in women born without ovaries, possibly including some intersex individuals (AIS comes to mind)...and trans women. (Combine this with a uterine transplant, if we could work out how to create ovarian cells from somatic stem cells, then...)