Core pieces to get assignee info into Gravity Flow status

functions.php

<?php

add_filter( 'gravityflow_columns_status_table', 'custom_column_titles', 10, 3 );
function custom_column_titles( $columns, $args, $table ) {
	$new_column = array(
		'assignees' => 'Assignee(s)',
	);
	$pre_columns = array_slice( $columns, 0, 2 );
	$post_columns = array_slice( $columns, 2 );
	$columns = array_merge( $pre_columns, $new_column, $post_columns );
	return $columns;
}

add_filter( 'gravityflow_field_value_status_table', 'custom_column_field_values', 10, 4 );
function custom_column_field_values( $value, $form_id, $column_name, $entry ) {

	if ( $column_name == 'assignees' ) {

		$api = new Gravity_Flow_API( $form_id );
		$step = $api->get_current_step( $entry );
		if( $step !== false ) {
			$assignees = $step->get_assignees();

			if ( $assignees ) {
				foreach( $assignees as $assignee) {
					if( $assignee->get_type() === 'user_id' ) {
						$value .= "<ul>";
						$value .= "<li><strong>KEY</strong>: " . $assignee->get_key() . '</li>';
						$value .= "<li><strong>TYPE</strong>: " . $assignee->get_type() . '</li>';
						$value .= "</ul>";
					}
				}
			}
		}

	}

	return $value;
}