If JSX is embedded in a codebase, what is the value of that? Let me clarify a bit. What is the value in creating a limited tool optimized for neophytes that will be used extensively by experienced professionals, who would be better served by flexibility?
I had a lot of success back in 2013/14 by having our outsourced graphic designer directly modify JSX files in our codebase. He picked up just enough javascript to figure it out. I just told him where the file was or set up a test harness and he delivered pull requests against our actual codebase.