help request: What is the best way to dynamically route a cluster by token in customer plugin? about apisix HOT 3 OPEN

 local up_conf = {
        timeout = {
            connect = 6,
            send = 300,
            read = 300
        },
        scheme = "http",
        type = "roundrobin",
        pass_host = "pass",
        keepalive_pool = {
            idle_timeout = 60,
            requests = 1000,
            size = 320
        },
        hash_on = "vars",
        nodes = {
            {
                priority = 0,
                port = upstream_port,
                host = parse_domain(upstream_host),
                weight = 1
            }
        }
    }

    local ok, err = upstream.check_schema(up_conf)
    if not ok then
        core.log.error("failed to validate generated upstream: ", err)
        return 500, err
    end

    local matched_route = ctx.matched_route
    up_conf.parent = matched_route
    local upstream_key = up_conf.type .. "#route_" .. matched_route.value.id
    core.log.info("upstream_key: ", upstream_key)

    upstream.set(ctx, upstream_key, ctx.conf_version, up_conf)