you are right, as of now this is a typical use case that has to be implemented inside of a client-side business object function (or a script activity, if you prefer to use that). Unfortunately server-side business objects (SBO) don’t support JavaScript Promises yet, but this is subject to change in a future Simplifier release where we plan to update the JavaScript engine of SBOs to make ECMAScript features of versions higher than 5.1 accessible. Please keep a close look on our changelog for that matter.
