A node to query partitioned DB in cloudant

I have been using node-red with my IBM cloudant DBs so far. Not partitioned. No problem.
With the cloudantPlus nodes.
However I'd like to switch to partitioned DB now, to optimize query cost.
I think I understood how it works, however, my first attempts where I basically added the partition key in my request where appropriate, were unsuccessful.

Are there some specific nodes to query cloudant partitionned DB?

No advice? Anyone?