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The path selector is based on JSON Path. It can be used to select and filter data from the source entity. This is available as input for array and for the dynamic property type to map data from the source entity. For dynamic mapping, the selector should result in a property value (single token). When using $path for the array input the result is expected to be a list of property values (multiple tokens). Mapping all source entity properties: 
"product": {
	"*": "p"
}
Consider, that you want the entire list of product features: 
"features": {
	"*": "p.features"
}
If you only want the name of the features: 
"tabs": {
  "type": "array",
  "input": {
    "$path": "p.features[*]"
  },
  "var": "feature",
  "items": {
    "type": "string",
    "value": "{item.name}"
  }
}
If you want all features with its display property equals true: 
"tabs": {
  "type": "array",
  "input": {
    "$path": "p.features[?(@.display==true)]"
  },
  "var": "feature",
  "items": {
    "type": "string",
    "value": "{item.name}"
  }
}
You can combine dynamic mapping and arrays: 
"tabs": {
  "type": "array",
  "input": {
    "$path": "p.features[?(@.display==true)]"
  },
  "var": "feature",
  "items": {
    "type": "object",
    "feature": {
      "*": "{feature}"
    }
  }
}
If you want the feature with its id property equals to a dynamic value: 
"tabs": {
  "type": "array",
  "input": {
    "$path": "p.features[?(@.id=='{p.primaryFeatureId}')]"
  },
  "var": "feature",
  "items": {
    "type": "string",
    "value": "{item.name}"
  }
}