How to get data from multiple child models to parent model

Summary:

I want to get the data of two attributes at 2 child model level and make it available in the parent model. How do I get the data from the lower child model (for multiple root model system configuration and multiple models under 1 root model configuration ) to the upper child model? I am having difficulty in creating the path

Content (required):

I have the following BOM structure.

Deployment model-

Parent Model- {Attribute3 = Attribute1 + Attribute2;}

Child Model 1 - {This has Attribute1;}

Child Model 2 - {This has Attribute 2;}

I tried the following code in the recommendation rule.

retVal = "";

jsonPaths = dict("string");

put(jsonPaths, "Attribute1","$.children[*].configAttributes.Attribute1"); // just fetching Attribute1 for now