Use the text-decoration control to allow users to set the text-decoration CSS property like so:
public function set_controls() {
$this->controls['textDecoration'] = [ // Setting key
'tab' => 'content',
'label' => esc_html__( 'Text decoration', 'bricks' ),
'type' => 'text-decoration',
'css' => [
[
'property' => 'text-decoration',
'selector' => '.text-wrapper',
],
],
];
}