The committee was asked if a lawyer could disclose confidential information to a person where there was no substantial purpose other than to preclude the other side from hiring the expert, and held “no.” Tex. St. B. Prof. Eth. Comm. Op. 676 (Aug. 2018) (here).
I’ve had lawyers do this to me, or at least that’s how it seemed, and it’s an irritating but understandable tactic when there’s only a few people in a field who know what they’re doing.
But don’t do it!