Apologies to all.
Yes you are right, you can’t add FCP-recognised Chapter markers during a capture with Live Capture Plus 2 (LCP2).
The statement from their website: “mark clips and events while a capture is in progress.” only puts a timecode into the notes field when you press Command-T “Insert Timecode Marker” and then allows you to type anything after that. You can put multiple timecode markers in this notes field. If you export the captured file as XML, it doesn’t make these ‘marker’s into real markers, but puts them in your clips notes field as one concatenated string. Obviously it would have been nice to have these exported as markers and then imported into FCP as markers, but Live Capture Plus can’t do that right now. I’ve just suggested it to the developers as feedback.
zrb123’s posting prompted me to download the demo software and have a closer look at it and markers in FCP.
The XML file exported from FCP for a clip with markers generates a definition inside the <clip> and </clip> pairs, for example – a marker at ten frames in from the beginning of the clip with a duration of 4 frames: