I was able to figure out how to hide a variation text on cart/checkout page.
Now how to hide it on my account page?
function get_cart_items_from_session( $item, $values, $key ) {
if ( $item['variation']['attribute_test-attr']=='Default' ) $item[ 'variation' ] = array();
return $item;
}
add_filter( 'woocommerce_get_cart_item_from_session', 'get_cart_items_from_session', 1, 3 );