Retrieve only specific custom var properties via director-api

I am looking for a possibility to only query a certain custom var from the director.
As I read here it is possible to specify a list of properties and for example “all custom vars” to return.
But I could not find out how to get specific custom vars.
I already tried vars.customvar1, _customvar1, host.vars.customvar1

Can anyone enlighten me? :slight_smile:

@tgelf can you tell me how one can query only one custom var from a host?
Or is my request not explained clearly enough?