It can be negotiated in a purchase contract.
Well, sure - - nearly anything can be negotiated in the contract, but typically the contract will simply specify a seller concession in the form of a flat dollar figure or a percentage like 3% or 6% (of the sale price), etc., "to be applied to buyer's costs".
I have never seen a contract drawn up specifying that a seller will pay for a buyer's title insurance. Of course, my thirty-plus years of experience in the business is all in Pennsylvania. Practices can differ in other states.