MPLab X 5.25 - How to set JTAGEN Fuse to Enabled(SET) instead of CLEAR (pallenfgcu)

I'm trying to figure out how to set the JTAGEN fuse bit to SET instead of CLEAR in MPLAB X 5.20 or 5.25, so I can use JTAG to program an ATXmega256A3BU through either an Atmel-ICE or JTAGICE3 programmer/debugger. This is for an AVRASM2 ARM Assembly projec..