Add stop, change color, custom gcode also on the in layer slider

[Tinchus2009]

Is your feature request related to a problem? Please describe.
Today we can create a change color stop, or add cutom gocode at a specifi layer change using the right slider after slicing. This is good for changing the color of a log for example, The bad: you change the color of the logo but also you change the color of the hole layer and this is noticeable on the perimeter for example.

But we have another slider that let us see how that layer progress. Im doing this now manually, but it would be more easy if we had the ability to add a custom stop, change color / add custom gcode, at a specific location using the bottom slider. In that weay we can change the color only starting at the infill for wexample, so a logo would have a different color but the main color would still be present on the outer object perimeter.

Describe the solution you'd like
Add the function os stopping/adding gcode the same as on the right slider to the bottom layer slider