Get the key and value from a select field

[CarrDarch]

Is it possible to retrieve both the key and value from a select type field?

I have a select field which can have multiple selections:

The field is set up to have a key and value pair used to make validation easier:

However, the API output only returns the keys:

Ideally I would like to get an object containing the selected options in a key-value pair, such as:

"development_additional_counties": { "greater-manchester" : "Greater Manchester", "lancashire" : "Lancashire", }

Is there a way of acheiving this?