Is there any way, via the API, to find which list is the trigger for a flow?

I don’t see any way of dereferencing the list (or segment) on which a flow is triggered, via any of the flow api calls (or list api calls).  It does appear in the internal klaviyo API but I assume that is not for customers to use.

I haven’t seen it in any of the flow-action calls nested in here either.

https://a.klaviyo.com/api/flows/abc123/

{
    "data": {
        "type": "flow",
        "id": "abc123",
        "attributes": {
            "name": "Test flow name",
            "status": "live",
            "archived": false,
            "created": "2024-01-05T15:41:40+00:00",
            "updated": "2024-01-05T15:41:47+00:00",
            "trigger_type": "Added to List"
        },
        "relationships": {
            "flow-actions": {
                "links": {
                    "self": "https://a.klaviyo.com/api/flows/abc123/relationships/flow-actions/",
                    "related": "https://a.klaviyo.com/api/flows/abc123/flow-actions/"
                }
            },
            "tags": {
                "links": {
                    "self": "https://a.klaviyo.com/api/flows/abc123/relationships/tags/",
                    "related": "https://a.klaviyo.com/api/flows/abc123/tags/"
                }
            }
        },
        "links": {
            "self": "https://a.klaviyo.com/api/flows/abc123/"
        }
    }
}

Observing the ajax call to get the flow data from the flow builder, I see the flow.trigger_id contains the list ID that the flow is configured to trigger (on subscribe).  It is also in the trigger_group.id field

https://www.klaviyo.com/ajax/flow/abc123?beta=true

{
    "data": {
        "flow": {
            "id": "abc123",
            "company_id": "MycmpnY",
            "name": "Test flow name",
            "folder_id": null,
            "trigger_type": 1,
            "trigger_id": "321cba",
            "trigger_filter": null,
            "customer_filter": null,
            "start_path": 33536647,
            "created": "2024-01-05T15:41:40Z",
            "updated": "2024-01-05T15:41:47Z",
            "deleted": null,
            "archived": false,
            "status": 2,
            "is_ignoring_holdout_group": false,
            "is_relative_timing": true,
            "ajax_actions_statistics_url": "/ajax/flow/abc123/actions/statistics",
            "ajax_trigger_filters_url": "/ajax/flow/abc123/trigger-filters",
            "ajax_customer_filters_url": "/ajax/flow/abc123/customer-filters",
            "ajax_details_url": "/ajax/flow/abc123/details",
            "transactional": {
                "is_eligible_for_transactional_email": false,
                "is_eligible_for_transactional_sms": false
            },
            "trigger_group": {
                "id": "321cba", 
                "company_id": "MycmpnY",
                "name": "Test flow name",
                "type": 0,
                "subtype": 0,
                "email_engagement_score": null,
                "definition": null,
                "deleted": null,
                "deactivated_at": null,
                "search_task_id": null,
                "has_found_members": false,
                "members_last_updated": null,
                "segment_task_id": null,
                "is_flagged": false,
                "sort_order": 0,
                "is_double_optin": false,
                "is_autoupdating": true,
                "is_tracking_stats": false,
                "is_global_unsubscribe": false,
                "is_cutover_to_sip": false,
                "last_used": "2024-01-04T17:09:42Z",
                "is_external_trigger": false,
                "allow_flow_triggers": true,
                "contact_name": null,
                "contact_email": null,
                "folder_id": null,
                "recipe_id": null,
                "is_email_profiles": false,
                "is_email_autoresponder": false,
                "found_percent_complete": null,
                "start_date": null,
                "language": "",
                "created": "2024-01-04T17:09:34Z",
                "updated": "2024-01-04T17:09:42Z",
                "url": "/list/321cba"
            },
            "extra":"..."
          }
     }
}

Is there anywhere on the customer-facing APis where this relationship can be found?

I tried some undocumented approaches like: adding ?fields[flow]=trigger_id and ?include=trigger_group but seems that this api is fairly limited.