@Ebony3812 I'd argue no, but that remains to be seen. Morgan Elsbeth, Thrawn, and Grievous appear in the series, and while they are associated, they are hardly Sith. Same could be said of Barriss Offee and the other Inquisitors, who aren't Sith by definition.
There are still some Sith tales may be worth telling. Any untold stories of Maul, Dooku, or maybe even Vader, if we're stuck within the Republic/Empire era. One also can't rule out having an adaptation of the Tragedy of Darth Plagueis the Wise or perhaps Project Necromancer, presuming neither stories become their own film or series.