Yes. It was developed by Bilirubin. He was researching how to send the children to other worlds in the old timeline as well. He said it could be used on people from other worlds as well.

[Don't feel hope don't feel hope don't feel---

... it's only because Cora-san refused to give up hope, you are alive. You owe it to your husband, to everyone in this village to try]

I'm Trafalgar D. [Water] Law. [He feels it's time to reveal that part of himself.] Let me know if you need me for anything.