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You can create an YANG module which augments the network-topology data tree with a leaf for the link's cost.

Create a yang file like this on your provider plugin:

module link-cost{
/* put all the required things for a module here like namespace and revision */

    augment "network-topology/topology/link"{
        leaf cost{
            type whatever-you-need; //I would recommend an enumeration
        }
    }
}