Select color by rgb codes

I would like to know, is it possible to define exact color for yeelight color bulb by assign rgb codes in application? For example, i wanna have this code 167, 0, 255; how should i reach it exactly ? Apparently the only available way of color selection is color ribbon! Do you know the other ways?
p.s I’m using yeelight app

Yeelight doesn’t provider exact code for color selection, cause the bulb doesn’t support all the random code, such as black(0,0,0). But we will change color selection to HSV instead of color ribbon in Yeelight 3.0, please hole on.

any ETA for the 3.0 version?

In the middle of September, I guess.