P: Amount slider in Color Grading panel

Hi Folks
Hopefully a simple feature request here but how about adding a 'Strength / Amount' slider to the Color Grading Panel in both Lightroom Classic and Lightroom CC just has been added recently for Presets?

The current workaround means Color Grading then creating a preset storing only the Color Grading adjustments. Then ... resetting the Color Grading and then applying the Preset, to then use the Amount Slider.

The Color Grading can obviously be reduced by adjusting each of the Color Wheels equally but to be able to contro the overal effect with an 'Amount / Strength' slider would be very welcome.

Just a thought ... thanks