espocrm-base/application/Espo/Modules/Crm/Resources/metadata/entityDefs/User.json

{
    "links": {
        "targetLists": {
            "type": "hasMany",
            "entity": "TargetList",
            "foreign": "users"
        },
        "targetListIsOptedOut": {
            "type": "bool",
            "notStorable": true,
            "readOnly": true,
            "disabled": true
        }
    }
}