Adobe After Effects - Manual (Page 704)

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cuePointName
parameters
Return type: String.
Contents of cue point Name field in marker dialog box.
Return type: associative array of String values.
Contents of Parameter Name and Parameter Value fields in marker dialog box.
For example, if you have a parameter named “background color”, then you can use the following expression to access its value at the nearest
marker:
thisComp.marker.nearestKey(time).parameters["background color"]
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