The status bar tilemap is controlled by $0EF9-$0F2F . Here is a diagram, which RAM controlls what.
Just keep in mind that the properties are hardcoded in ROM and isn't (directly) controlled through RAM.
Edit: Man, what's up with the HTML tags?
Draw Thing On Status Bar with UberASM
I actually tested it and it should work. However, you want to draw the YES at the same position where the dragon coins are located. These overwrite your YES so you should place it one row lower.