You can certainly output react code to the server from the cms, but that code will not run within the cms itself. If you are looking for information about your specific instance we recommend opening a support ticket.
David Greenberg Customer Support Engineer
## If I’ve helped, accept this response as a solution so that other’s can find is more quickly in the future. ## Have thoughts on Crownpeak products? We'd love to hear them. Speak with the Crownpeak Product Team..