I had exactly the same. turned out to be one of the studs that holds the water pump onto the timing chain cover. there was a leak through a weld repair.
Way I found it was sump off, and I filled the radiator. I was easily able to see the coolant came from the front of the engine. See below link…
https://forums.jag-lovers.com/t/need-advice-on-diagnosis-water-into-oil-concluded/