I thought that maybe the course either existed already or that the feature request may already exist but I looked into both and don’t see either of them. I did see questions on this forum related to using Jest but none were a “feature request”. And I looked through the curriculum (including “Quality Assurance Certification”) and didn’t notice anything specifically related to Jest there (maybe I missed it).
I would love to see A Jest Testing Certificate offered offered on freeCodeCamp. I think it would really round out the curriculum nicely.