How does the Caravanserai work?

I want to make a building that curates nearby units like the caravanserai does with merchant carts.
I’ve put the task of “aura” to my building but it doesn’t heal nearby units. What other property should I add to the building or how does the “Aura” task work? since in addition to curing it also makes the goods carts move faster

You must set the break off combat value to 32 to start the aura.

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