fillLineGap
Specifies how to handle the gap between the lines (in multi-line captions). - enabled: Fill with the captions background color (as specified in the input captions). - disabled: Leave the gap unfilled.
Specifies how to handle the gap between the lines (in multi-line captions). - enabled: Fill with the captions background color (as specified in the input captions). - disabled: Leave the gap unfilled.