Custom Vessel build (v3.5.1, theme_store_id: null). Go to Styles & Settings → General Settings → Display to enter these settings.
Settings
Inject: Before
Selector type: CSS selector
Selector: .variant-picker
Custom CSS
Add to Advanced → Custom CSS:
.ks-chart-container.sizing-chart-container {
margin-bottom: 20px;
}
Places the chart above all size options, not adjacent to the label. Use v3.0.0 settings if you want the chart near the Add to Cart button instead.