modify Elementor widget

Question

How i can add new social icon for Widget_Social_Icons() ?

I can add new icon for Control_Icon()

function jet_modify_controls( $controls_registry ) {
    // Get existing icons
    $icons = $controls_registry->get_control( 'icon' )->get_settings( 'options' );
    // Append new icons
    $new_icons = array_merge(
        array(
            'fab fa-viber' => 'viber',
        ),
        $icons
    );
    // Then we set a new list of icons as the options of the icon control
    $controls_registry->get_control( 'icon' )->set_settings( 'options', $new_icons );
}
add_action( 'elementor/controls/controls_registered', 'jet_modify_controls', 99, 1 );

I found action "elementor/widgets/widgets_registered" but i cant find method for adding new icon for him