Wow, from what I've heard that's pretty rare ;-;
I don't know much about this personally, but I know that the YouTube channel CrabCentralStation just spent the summer trying to get the zoea that hatched out of their crab's eggs to survive. Its a very difficult and time consuming process. Apparently there has been only one recorded person in the world who has had success in trying to raise captive bred hermit crab babies to the point where they can be given up for adoption. (this is part of a plan to help reduce the amount of hermit crabs taken from the wild to be pets), and CrabCentralStation is doing their best to contribute to the information gathered on that front. They also have a lot of other good information about crab care. They are one of the only hermit crab YouTube channels that I trust haha.
If you want to look into it more they have a lot of information on their YouTube channel.
Here are some links that I hope will be helpful to you:
https://youtube.com/playlist?list=PLWLq ... Jc4KNsVcdN
https://youtube.com/playlist?list=PLWLq ... Rk7V0NcCY5
Sorry I don't know much about this topic myself, so if anyone wants to but in with more useful information please do haha
Good luck and have a great day!