I'd love to know how this came to path
It's either pee, or there's a slope/ditch and when raining the water flows only there.
I was thinking there could be a drainage pipe buried in a trench under the "path"
It can also be a hot water pipe, which gives out enough heat to protect the plant roots from freezing during winter.
That is the most common cause for such phenomena
Desire paths Desire paths can be paths created as a consequence of erosion caused by human or animal foot-fall or traffic. The paths usually represent the shortest or most easily navigated routes between origins and destinations. https://en.wikipedia.org/wiki/Desire_path
