Add setProfile to the API

Heyho,

would be cool if we could expose something like `setProfile` to set the profile.

I'll try to take this on 💪

Start by locating the API entry points and reading how the public API is organized. Define what exposing setProfile should accept and change, then verify that the API provides the new method; the issue names no files or tests, so the completion criteria are otherwise unspecified.

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