Yes, Procreate, Infinite Painter and Adobe Fresco use sliders.
Also in good old photoshop there is a slider and a number box.
The number box is usually on the right side above the slider. Or next to it.
In ASP there is often enough empty horizontal space between the feature title (flow, max flow, opacity..) and the number box, suitable for a slider there.
Maybe it’s something to consider in future versions,
Thanks!