You can make the same in Moi ;)

Just make first avery little fillet like 0.02 as you don't know yet what is working...
Then a Variable fillet 0.2 where you want for test
et voilà !



Seems 0.25 a maximum for a uniform fillet


You can Draw an Helper line(s) during the Variable fillet before the first click for have symetrical things!


Forgotten the top fillet!
In 2 passes : first the top second... new one only the front face...surrely several possibilities...