Extracting seasonality/holiday from Prophet

I am trying to use Prophet to calculate seasonality to be used in a separate model, as opposed to for end-to-end forecasting. Is there a straightforward way to pull the seasonality and holiday variables created?

The issue names no files, tests, or entry points. Start by reviewing Prophet's public API and forecasting documentation to determine whether generated seasonality and holiday variables can be extracted separately; done means identifying a supported extraction path or documenting that the capability is unavailable.

Written by the indexing model from the issue text.