A BrowsePath consists of a StartingNode defined by its NodeId and a RelativePath from the StartingNode to the target Node. A RelativePath consists of one or more RelativePathElements, which consist of:

The NodeId of the ReferenceType
A boolean that specifies whether or not it’s an inverse Reference
A boolean that specifies whether or not subtypes of the ReferenceType should be followed
A QualifiedName that specifies the BrowseName of the target Node

If you know the NodeId of an instance of a Type and you know that instances of the Type should target a Node with a specific BrowseName with a specific ReferenceType, then you can use TranslateBrowsePathsToNodeIds Service to get the NodeId of that Node.

I don’t quite understand the Server structure you’ve drawn, but assuming that Value2 is part of the ObjectType that Boiler is an instance of and that you know the NodeId of Boiler and all BrowseNames and ReferenceTypes between it and Value2, then you can construct a sequence of RelativePathElements that lead from Boiler to Value2 and use the NodeId of Boiler and that sequence as the inputs of TranslateBrowsePathsToNodeIds Service to get the NodeId of Value2.

You can’t start from root or Objects when using TranslateBrowsePathsToNodeIds since those Nodes aren’t instances of a Type that would define the path to Value2.