if you had an array of latlng's called points (and you loaded the
geometry library and were using ELabels):

for (var i = 0; i < points.length-1; i++) {
        var
dist=(google.maps.geometry.spherical.computeDistanceBetween(points[i],points[i
+1])/1000).toFixed(2)
        var mid=google.maps.geometry.spherical.interpolate(points[i],points[i
+1],0.5)
    var label = new ELabel({
                        latlng: mid,
                        label: dist+" km",
                        opacity: 0,
                        overlap: true,
                        clicktarget: false
                        });
                        label.setMap(map)
                }
        }

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