Include HTML in a review through import

add_filter( 'preprocess_comment', 'wpse_340526_preprocess_comment' );

function wpse_340526_preprocess_comment( $commentdata ) {
    if( 'wpse_response' === $commentdata['comment_type'] ){
        global $allowedtags;
        $allowedtags['pre'] = array('class'=>array());
        $allowedtags['h2'] = array();
        $allowedtags['h3'] = array();
        $allowedtags['h4'] = array();
        $allowedtags['h5'] = array();
        $allowedtags['h6'] = array();
        $allowedtags['ul'] = array();
        $allowedtags['ol'] = array();
        $allowedtags['li'] = array();
		$allowedtags['a'] = array();
		$allowedtags['b'] = array();
		$allowedtags['br'] = array();
    }

    return $commentdata;
}