I am able to get fields related to an object doing a GET request:
https://[...].suitetalk.api.netsuite.com/services/rest/record/v1/metadata-catalog/customer
And sending as header: Accept: application/schema+json
On this response I get a custom field called: "custentity_companypublicprivate", which in the UI is a dropdown, and the values on this dropdown are a custom list.
Manually I was able to get which is the custom list related: "customlist_compnaypublicprivate"
But I need to get this relationship through code since I need to do this for all fields which are a custom list and in the response I can not find any information which tells me which is the custom list related.
This is the definition of the object:
"custentity_companypublicprivate": {
            "type": "object",
            "properties": {
                "id": {
                    "title": "Internal identifier",
                    "type": "string"
                },
                "refName": {
                    "title": "Reference Name",
                    "type": "string"
                },
                "externalId": {
                    "title": "External identifier",
                    "type": "string"
                },
                "links": {
                    "title": "Links",
                    "type": "array",
                    "readOnly": true,
                    "items": {
                        "$ref": "/services/rest/record/v1/metadata-catalog/nsLink"
                    }
                }
            }
        }
Is there a way to do this?. Thanks in advance for your help.