How to get the value of person attribute

I am trying to import the person and it's employment data from Personio. Hire date is one of the reset attributes and also selected for Readable employee attributes. I set the value for the person with id - 23808419 but, still not received within person's data from API - https://api.personio.de/v2/persons.

I also checked for the attribute id in API response - https://api.personio.de/v1/company/employees/custom-attributes. As per that, the attribute id is hire_date but, still there is no custom_attributes with hire_date as global_id or id.

How can I get the value of hire_date?

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How to get the value of person attribute - hire_date?