diff --git a/src/wp-includes/user.php b/src/wp-includes/user.php
index a1478679f6..f84bade569 100644
--- a/src/wp-includes/user.php
+++ b/src/wp-includes/user.php
@@ -3003,10 +3003,57 @@ function wp_user_personal_data_exporter( $email_address ) {
 		}
 	}
 
+	// get the list of reserved names.
+	$reserved_names = array_values( $user_prop_to_export );
+
+	/**
+	 * Filter to extend the Users personal data for the privacy exporter.
+	 *
+	 * @since 5.4.0
+	 *
+	 * @param array    $additional_user_data {
+	 *     An array of name-value pairs of additional user data items.  Default: the empty array.
+	 *
+	 *     @type string $name  The user-facing name of an item name-value pair, e.g. 'IP Address'.
+	 *     @type string $value The user-facing value of an item data pair, e.g. '50.60.70.0'.
+	 * }
+	 * @param WP_User  $user           The user whose data is being exported.
+	 * @param string[] $reserved_names An array of reserved names.  Any item in
+	 *                                 `$additional_user_data` that uses one of these
+	 *                                 for it's `name` will not be included in the export.
+	 */
+	$_extra_data = apply_filters( 'wp_privacy_additional_user_data', array(), $user, $reserved_names );
+
+	if ( is_array( $_extra_data ) && ! empty( $_extra_data ) ) {
+		// remove items that use reserved names.
+		$extra_data  = array_filter(
+			$_extra_data,
+			function( $item ) use ( $reserved_names ) {
+				return ! in_array( $item['name'], $reserved_names );
+			}
+		);
+
+		if ( count( $extra_data ) !== count( $_extra_data ) ) {
+			_doing_it_wrong(
+				__FUNCTION__,
+				sprintf(
+					/* translators: %s: wp_privacy_additional_user_data */
+					__( 'Filter %s returned items with reserved names.' ),
+					'<code>wp_privacy_additional_user_data</code>'
+				),
+				'5.4.0'
+			);
+		}
+
+		if ( ! empty( $extra_data ) ) {
+			$user_data_to_export = array_merge( $user_data_to_export, $extra_data );
+		}
+	}
+
 	$data_to_export[] = array(
 		'group_id'          => 'user',
 		'group_label'       => __( 'User' ),
-		'group_description' => __( 'User&#8217;s profile data.' ),
+		'group_description' => __( 'User&#8217;s meta data.' ),
 		'item_id'           => "user-{$user->ID}",
 		'data'              => $user_data_to_export,
 	);
diff --git a/tests/phpunit/tests/user.php b/tests/phpunit/tests/user.php
index 74c533b69d..9c1c3671b9 100644
--- a/tests/phpunit/tests/user.php
+++ b/tests/phpunit/tests/user.php
@@ -1671,4 +1671,58 @@ class Tests_User extends WP_UnitTestCase {
 		// Number of exported user properties.
 		$this->assertSame( 11, count( $actual['data'][0]['data'] ) );
 	}
+
+
+	/**
+	 * Testing the `wp_user_personal_data_exporter_no_user` function when no user exists.
+	 *
+	 * @since 5.4.0
+	 *
+	 * @ticket 47509
+	 */
+	function test_filter_wp_privacy_additional_user_data() {
+		$test_user = new WP_User( self::$contrib_id );
+
+		add_filter( 'wp_privacy_additional_user_data', array( $this, 'export_additional_user_data' ) );
+
+		$array = wp_user_personal_data_exporter( $test_user->user_email );
+
+		remove_filter( 'wp_privacy_additional_user_data', array( $this, 'export_additional_user_data' ) );
+
+		$num = 0;
+
+		foreach ( $array['data'][0]['data'] as $data ) {
+			foreach ( $data as $key => $value ) {
+				if ( 'Test Additional Data Name' === $value ) {
+					$num++;
+				}
+
+				if ( 'Test Additional Data Value' === $value ) {
+					$num++;
+				}
+			}
+		}
+
+		$this->assertSame( 2, $num );
+	}
+
+	/**
+	 * Filter callback to add additional data to the User Group on Export Requests.
+	 *
+	 * @since 5.4.0
+	 *
+	 * @ticket 47509
+	 *
+	 * @return array $additional_data The additional User data.
+	 */
+	public function export_additional_user_data() {
+		$additional_data = array(
+			array(
+				'name'  => 'Test Additional Data Name',
+				'value' => 'Test Additional Data Value',
+			),
+		);
+
+		return $additional_data;
+	}
 }