Returns a formatted property value of the child configuration at specified index. Properties of reference type can be followed to instead return a property of the referenced object. If no matching child or property is found, then an empty string is returned.
string ChildPropertyF(string format; int index; string propertyName; [string propertyName2]; ...)
| format | Format specifiers to apply when converting the property to string. Search Microsoft's documentation about "format strings". | 
| index | Zero-based index of the child configuration to read the property from. | 
| propertyName | Name of a property to read. | 
| propertyName2 | Optional name of a property to read from an object that is referenced by the first property. | 
Example
ChildPropertyF("yyyy-MM-dd"; 2; "CreationDate")
Returns the creation date in a format like "2025-12-31" of the third child configuration.
