add extra Local business sub type

gistfile1.txt

add_action( 'after_setup_theme', 'add_my_custom_meta_field' );
function add_my_custom_meta_field() {
    add_filter( 'wp_schema_pro_schema_meta_fields', 'my_extra_schema_field' );


function my_extra_schema_field( $fields ) {
    $fields['bsf-aiosrs-local-business']['subkeys']['schema-type']['choices']['ExerciseGym  '] = esc_html__( 'ExerciseGym  ', 'wp-schema-pro' 
    ); //you can add as per schema.org name insted ExerciseGym"

    return $fields;
}
}