So ChatGPT took that input and spit out an attempt to interpret it, but missed a few points.
It didn't know how to interpret the hexadecimal string at all. It gives advice on editing a specific character in an array of strings split from a larger string.
It's missing the most important part - getting that hex data into a readable format in the first place. Once we get that, rather than editing a specific byte, we present the item name to the user in a readable format.
Addressing the reason you want this in the first place, we'd add a little extra processing on what Temporal Flux already does. So in the case of custom characters added to the font, we'd let users specify {hex 4B} or whatever, and when turning that back into raw data, it would recognize the {hex ??} format, and turn it into just the value 4B.