You can't because it's not there, AMD made sure to cause chaos once again! Here's a link that you might want to read...
Enough with them and their tactics adding annoyances and removing useful features.
Note that Radeon Chill is Disabled if Radeon BOOST is used.
Therefore use of Chill_Min = Chill_Max to control maximum Frame Rate is impossible.
This is yet another reason to request that the separate FRTC slider to Chill_Max is put back into the driver.
Or is it assumed that everyone has a FreeSync Monitor or that it is mandatory to turn in game VSYNC on.
Global FRTC control is back in Adrenalin 2020 21.3.1 Driver for RX5700XT -> R9 390X.
This is great news.
It works with Radeon Chill do you can set FRTC = 59, Chill min FPS = 30 Chill max "FPS" = 300 and run an RX Vega 64 Liquid on BFV at 4K Ultra with ~ reasonable 59 FPS 4K Experience with Vsync off.
Now all Radeon Team need to do is adjust chill behaviour so that you can hit more than 55 FPS with those settings with keyboard only input.
Please mark this as the correct answer.