Modify curve in the timeliner

is it possible or any workaround? The curve type in the timeliner is a rigid one, as it can t be edited as a bezier curve.
I tried the Curve Ratio module but it doesn t give me a smooth output (stuff for another thread though).

you can build(emulate) the desire curve by adding extra (intra)keyframes-
not best/precise solution with lots limitations, but that’s what I did once