Just put whatever you want there. It’ll not be legible at the resolution you’ll be working with. Here are examples of what I used to label my paints with:

Door handle instructions Vers1: “This text is too small to be read. So I will type whatever I want”

Door handle instructions Vers2: “If it ain’t flush it ain’t fit to push”

Pitot tubes I labeled: “Hot hot hot and pointy”

Static ports: “Do not cover, paint or use as shaving mirror”