Add interactions to weekly/daily periods for hourly univariate time series data

I have hourly data univariate time series that exhibits interactions within daily and weekly periodicities (periods=24 and 168, respectively) I am trying to add seasonal interactions for these 168 regressors (ie Monday/8am, Monday/9am, Tuesday/9am,etc) but am unclear how to do so unless I add them manually under additional regressors. Is this interaction possible with prophet?

The issue names no files, tests, or entry points. Start by locating Prophet's seasonalities and additional-regressor documentation and implementation, then determine whether interactions between the 24-hour and 168-hour periods are supported. Done means a documented supported approach or a confirmed limitation with a clearly scoped implementation path.

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