Is there a way to insert a "marker" in the Audio event itself?

[ggmanestraki]

I don’t know if it’s what you need or if it will suit you, but have a look at the Create Markers from Hitpoints command.

[WIKI] All Key Commands in Cubase 11.0.41

Commands: Hitpoints All the commands work with multiple selections (1 tool). If a range is selected (2 tool), hitpoint processing will apply to the whole event caught in the range, and not just the range. Command Default Key Function My Rating Link Calculate Allows you to manually create Hitpoints for the selected event(s). (If Preferences>Editing>Audio>Enable Automatic Hitpoint Detection is unticked) 7 Editing Hitpoints Manually Create Audio Slices from Hitpoints Slices up the …

You can relax the hitpoint detection, so you only get a few hitpoints, and then give the command. Markers will be created from the hitpoints.