Temporal Table Indexes

I have been enjoying using the temporal table feature introduced in EF Core. However, the performance of queries in the history tables degrades quick significantly with time. To offset this I wanted to add some indexes to the history tables. I cannot find a way to add these in EF Core. Is there are way to add indexes to the history tables that I am missing? Or am I stuck managing indexes outside of EF Core migrations?

If this is no yet a feature in EF Core I would like to add this as a feature request.