How can one upgrade my TS in scattered castles to JPAS?

Greetings,

I was thought to be considered for a position that required a “TS” but it was learned the clearance was in “Scattered Castles” and needed to be a “JPAS” clearance. Time prohibited a transfer.

How can one “upgrade” or make that transition into a JPAS or become JPAS eligible?

Respectfully,

CEDJR