function schema_for_contact_page() {
    /* Will work only for the pages where the page slug it's contact ,Contact or CONTACT */
    if( is_page( array( 'contact','Contact', 'CONTACT') ) ){
        add_filter( 'kleo_schema_org_type', function() { return 'ContactPage'; } );
    }
}
add_action( 'wp', 'schema_for_contact_page' );