$jit.ForceDirected how can i specific each edge's length

[westkayak]

// Change node and edge styles such as
// color and width.
// These properties are also set per node
// with dollar prefixed data-properties in the
// JSON structure.
Node: {
overridable: true
},
Edge: {
overridable: true,
color: '#23A4FF',
lineWidth: 2
},

this is what i see in the sample
but as imformed above , can i sepcific each one of the edge>
or change the length?