Where can I set up RPN more precisely to use with pitch bend in Musescore 3.6.2?

It is said that the bending in Musescore 3.6.2 is only suitable for guitars and is not suitable for other electronic instruments by default, so downward bending cannot be achieved. (seen in bend1.png and bend2.png)


Or can tremolo bar approximate the effect of bending instruments other than the guitar?


In addition, in the graphs of bend and tremolo bar, what is the value represented by the unit length of the horizontal and vertical axes? Does the time represented by the horizontal axis refer to the time starting from the note to which the bend/vibrato effect is added?