Defining variables in Azure Cosmos DB Graph query

Question

I am struggling with running the pagination script on Azure Cosmos DB Graph, using Gremlin.NET:

t = g.V().hasLabel('person');[]
t.next(2)
t.next(2)

It comes from Tinkerpop page where it is described how to reuse traversal instance to avoid loading the whole graph.

Unfortunately, in Gremlin .NET I get:

ExceptionType : GraphSyntaxException
ExceptionMessage :
  Gremlin query syntax error: Unsupported groovy expression kind: t=g.V().hasLabel('person') @ line 1, column 1.

Probably this kinda structure is not supported by Azure Cosmos DB Graph, but I cannot find any materials that would prove it.