NEST battery doorbell with LLMVision

Third party integrations
1

trying to test our LLMVision GitHub - valentinfrlch/ha-llmvision: Let Home Assistant see! using my nest doorbell via the NEST integration Google Nest - Home Assistant

I have been using the NEST integration for ages and have automations sending images to notifications using the media API but I cannot see how to give an image to the LLMVision service. I tried just using the same approach as the media api to notifications (giving it {{ trigger.event.data.attachment.image }} as the image) but I guess theres something clever with the notifications service that can access that image as LLMVision says it cannot load the image.

Ive also looked at how I might directly access the image by inspecting the urls in the media browser:

https://myhaurl/api/hassio_ingress/STRING1HERE/api/file?filename=/homeassistant/nest/event_media/STRING2HERE/STRING3HERE-doorbell_chime_thumb.gif

I can see STRING1 and STRING2 dont change but not sure what STRING3 is and how I can get that from the event?