Fillet in Corner Two Walls

[planner_matlabi]

In designing some spaces in the corners of the wall, we have this mode (such as a pool)
But there's no way in Revit

Of course, I solved the problem by creating a mode in Place and joining it with the wall, but it needs a simpler way.

[mehrdad.rahimi.en65]

hi dear mr matlabi, i used your solution and it was very useful. and thank you