I'm just now migrating my postman collections to .rest text files and the REST-client plugin for vscode (that name is both good and bad at the same time btw, it like marketing a new car and naming it "Car").
Grantet it does not do everything Postman does but I'm pretty happy so far. Environment variables and secrets stays in a workspace settings.json and the .rest files can be version controlled and shared.
Always bet on text!