20. Button group

'button_group' => array(
    'type' => 'button_group',
    'label' => esc_html__('Button Group', 'my-domain'),
    'value' => 3,
    'options' => [
        1 => 'One',
        2 => 'Two',
        3 => 'Three',
        4 => 'Four',
    ],
),