Get parent express entry id from attribute controller

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I am creating a custom attribute as mentioned inhttps://documentation.concrete5.org/developers/attributes/creating-c... I saw that we can get the current attribute value using the attributeValue object. I have added this attribute to and express object. Is it possible to get the express entry ID of the attribute from the attribute controller ? For example the attribute "name" have value "John" for the "Test" express object entry with ID 5. So I need to get the entry ID (5) in the attribute controller. Can anyone please point out if any library functions are available for achieving this.