The Chinese are my favorite civ because of the taxation mechanic. It is a unique bonus and I would like to link it to the dynasty mechanic.
My idea is that the dynasties could ad different bonuses to the taxation mechanic.
Examples for bonuses are
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an imperial official tasked to a drop-off building could increase the amount of extra resources generated.
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an imperial official tasked to a building could increase the amount of taxes generated.
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When an imperial official collects taxes, a small amount of a different resource is added to the taxes similar to the grand bazaar tech from the Abbasid Dynasty
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an imperial official tasked to a production building could reduce the cost of units and techs.
Because of the dynasty mechanic there could only be one bonus active.