'reading_time' parameter not returned when used in 'fields' query of Ghost Content API

[Adonia83]

Issue Summary:
When using the Ghost Content API, specifically the "/posts/" or "/pages/" endpoints with the "field" query parameter to specify the fields to be returned, the "reading_time" parameter does not function as expected. While other parameters work fine, attempting to limit the fields returned by including "reading_time" results in unexpected behavior.

To Reproduce:

1. Make a request to the "/posts/" or "/pages/" endpoint of the Ghost Content API.
2. Include the "field" query parameter with the value of "reading_time" to limit the fields returned to just the reading time.
3. Observe that the response does not return "reading_time".

Technical details:

• Ghost Version: 5.80.0
• Node Version: Unknown
• Environment: Production
• Browser/OS: Not relevant
• Database: MySQL 8

[Tanu1201]

Hey, I am Tanu Sharma can I take this up?
I have 2+year of experience in this field.