if i want to add multiple class in elementor typography group control.how can i do that?

I've used this modified typography group control.but this dosen't work properly.

$this->add_group_control(
                Group_Control_Typography::get_type(),
                [
                    'label'    => esc_html__('Typography', 'astrip-core'),
                    'name'     => 'astrip_package_without_discount_style_heading_sub_title_typography',
                    'selectors' => [
                        '{{WRAPPER}} .section-title2 span;',
                        '{{WRAPPER}} .section-title3 span;',
                    ],

                ]
            );