For what it's worth, I was able to accomplish what you ask with the following SCSS.
It'd be nice if this was supported directly by Ionic, but I can't find anything indicating this is built-in.
button[ion-fab] {
overflow: visible;
position: relative;
ion-label {
position: absolute;
top: -8px;
right: 40px;
color: white;
background-color: rgba(0,0,0,0.7);
line-height: 24px;
padding: 4px 8px;
border-radius: 4px;
}
contain: layout;
}
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