CustomEntityRelation

{
    "is_delete_protected": false,
    "has_draft": false,
    "id": "01234567-abcd-dcba-ffff-000000000000",
    "is_deleted": false,
    "modified": "2019-01-01T00:00:00",
    "created": "2019-01-01T00:00:00",
    "field_1": "http://example.com",
    "field_2": "http://example.com",
    "entity_filter_1": {},
    "entity_filter_2": {},
    "field_1_id": "01234567-abcd-dcba-ffff-000000000000",
    "field_2_id": "01234567-abcd-dcba-ffff-000000000000",
    "has_is_primary": false,
    "show_related_1": false,
    "show_related_2": false,
    "show_tab_1": false,
    "show_tab_2": false,
    "tab_name_1": "string",
    "tab_name_2": "string",
    "is_published": false,
    "revision": 1
}