[deathanatos]

You could just apply the standard CSV escaping mechanism, so a single poop in a cell is represented in the file by 4 poop emoji. (Two to quote, one to escape, one as a literal. See RFC 4180 if you're still confused on "why 4?")

[dwheeler]

Sure, but we already have CSV. A different format should have some advantage over existing formats. If you have to escape it either way, then use the format people can already process.