GravityExport field: NotesField
There is no notes field. But we do (sometimes) have notes associated with the entry. The NotesField  adds these notes to the output by merging all notes into one cell.
Filters
- gfexcel_notes_value_{form_id}- This filter can change the content of the notes cell. To make things easier the filter actually gets 2 arguments; the current value and all the notes. 
Example
/**
 * Filters the value of the "Notes" field during a GravityExport export.
 *
 * This hook allows you to customize the exported value of entry notes.
 * You can use the `$notes` array to modify or format how notes are displayed
 * in the exported file.
 *
 * @since 1.0.0
 *
 * @param string $value The current field value for the Notes field.
 * @param array  $notes An array of all notes associated with the entry.
 *
 * @return string The modified field value to be exported.
 */
add_filter(
	'gfexcel_notes_value',
	function ( $value, array $notes ) {
		// $value is the current value for the Notes field.
		// $notes is an array of all notes for the current entry.
		// You can modify the output here using the notes data.
		return $value;
	},
	10,
	2
);
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