WeatherMap aggregate custom OID

Hi,
I hope this hasn’t been covered before.

We have many MX204 BNGs and I am graphing the total Subs count by using a custom OID (jnxLicenseFeatureLicenseUsed).

What I want, is to create an aggregate with all Subs from all of our BNGs.

The “show RRD command” option shows that the rrd name has this format:

/x.x.x.1/customoid-jnxLicenseFeatureListTable_scale-subscriber.rrd:oid_value:AVERAG

/x.x.x.2/customoid-jnxLicenseFeatureListTable_scale-subscriber.rrd:oid_value:AVERAG

etc...

So, I have tried creating under Weathermap a new link with the below as “Data Source” (based on how traffic link aggregation Data Sources work)

./x.x.x.1/customoid-jnxLicenseFeatureListTable_scale-subscriber.rrd:oid_value:AVERAGE ./x.x.x.2/customoid-jnxLicenseFeatureListTable_scale-subscriber.rrd:oid_value:AVERAGE

But it is not working. I tried couple variations as well with no luck.

So, can this be achieved some how or its not possible?

Many thanks,
Frank