Add New Section

Use this filter during after_setup_theme:

add_filter( 'h_customizer_options', function( $sections ) {
return wp_parse_args( [
  
  'section_id' => [
    'title' => __( 'Section Name' ),
    'container' => [ 'priority' => 10 ],
    'css_selector' => ':root',
    'options' => [
      'option1' => [ ... ],
      'option2' => [ ... ],
      'option3' => [ ... ],
    ]
  ]

], $sections );
} );