I know your issue has already been resolved, however I have provided this comment for others who may be looking for a summary of this post.
To wrap it up,
you were expecting something like Package Manager
where you can add json packages or packages directories (by project)
However, as BigRoy mentioned this is achievable by environment variables and tools configuration (by particular houdini version, by asset, by project)
This method is general! (it can be used with any DCC)
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