Dead battery & can't open trunk with key

Can anyone tell me where there is a + terminal on a 2004 Jaguar XJ8 that I can use to charge the battery enough to open the trunk?

Would this do the job !

https://forums.jag-lovers.com/search?context=topic&context_id=371415&q=Open%20trunk%20with%20dead%20battery%20x308&skip_context=true

There is a youtube video showing an under hood hot (+) stud to use, then ground to frame to get enough power for trunk release