FHIR Terminology API Postcode data

We are looking at the possibility of migrating from the GridAll file to the API.
It looks like the easting and northing data is not in the API version. Is it available in any of the other APIs or do we need to continue getting the data from the GridAll file?

Thanks

I can confirm that at present, the Organisation Data Terminology FHIR API does not contain grid references. ODS cannot comment on any other NHS APIs.