GitHub REST API /user/starred missing star create date

Response from the REST API when calling the /user/starred endpoint doesn’t include the date when the repo was starred by the user. The documentation here says:
“You can also find out when stars were created by passing the following custom media type via the Accept header:”

What “following” custom media type should I add to the Accept header? I’ve tried all of the custom media types (including the preview ones) to no avail.

'Accept: application/vnd.github.v3.raw+json'
'Accept: application/vnd.github.v3+json'
'Accept: application/vnd.github.v3.full+json'
'Accept: application/vnd.github.mercy-preview+json'

^ These are all of the media types that I’ve tried. Did I miss anything?