@ikks
There is a font white on a solid circle BG see: https://fontsgeek.com/fonts/CombiNumerals-Pro-Bold
I use the "regular" version all the time, it maps to the qwerty keys q=1...w=2...
An alternative since you are using linux, inserting a unicode character. shift-ctrl-u + a code circle number starts at 2460 and solid circle number starts at 2776.
This a little video animation of that: https://i.imgur.com/eNbBkN7.mp4
EDIT: Have to confess, I had to look up satty - Fedora or Arch maybe ? Gimp comes with a screen capture facility, (at least it does with X11, don't know about Wayland). You do have to remember to minimise Gimp on a delay for the screenshot.
Adding annotations as text, you move a text box around shift-alt-click-n-drag or later with the move tool. Save as a Gimp .xcf and those layers are editable in the future: An example screenshot + text https://i.imgur.com/mAD5zam.mp4
There is a font white on a solid circle BG see: https://fontsgeek.com/fonts/CombiNumerals-Pro-Bold
I use the "regular" version all the time, it maps to the qwerty keys q=1...w=2...
An alternative since you are using linux, inserting a unicode character. shift-ctrl-u + a code circle number starts at 2460 and solid circle number starts at 2776.
This a little video animation of that: https://i.imgur.com/eNbBkN7.mp4
EDIT: Have to confess, I had to look up satty - Fedora or Arch maybe ? Gimp comes with a screen capture facility, (at least it does with X11, don't know about Wayland). You do have to remember to minimise Gimp on a delay for the screenshot.
Adding annotations as text, you move a text box around shift-alt-click-n-drag or later with the move tool. Save as a Gimp .xcf and those layers are editable in the future: An example screenshot + text https://i.imgur.com/mAD5zam.mp4