i don't know what do you mean by using ASCII ,do you mean that we can translate some symbols using ASCII... here is an example: (how we can read this)
https://imgur.com/a/YurM0There is a < symbol and Y letter in bold blue between dove chest and phoenix.
This is related for decoding flames so integer range 0-255 can be decoded to characters.
The minecraft server are all offline currently.
Overlay for 14722 idea:
https://imgur.com/a/1QyaS