yes they are also possible .
But it will require to fill up the html tag in menu label which will be yes messy but it will get things done like you want .
add the image :
http://prntscr.com/l73oot
please try adding this custom css in your wp-admin -> appearance -> customize -> custom css :
header nav li img,.sidemenu li img{
width: 50px;
}
header nav li a strong,.sidemenu li a strong{
display: grid !important;
grid-template-columns: 1fr;
algign-items:center;
justify-items:center;
}