encoder to change PWM value to VFD

Hi,
I have a VFD which speed is controlled by a PWM signal (converted to 0-10Vdc).
PWM generated by a RPI4 on which Linuxcnc is installed (QTDragon)
Now I am willing to use an encoder, such as a KY-040 or EC11 to change the PWM value and so to adjust manually the speed of the VFD.
Has anyone experience with this? How should I modify my HAL file?
Thanks for your inputs.

Hello,

You can connect the output of the encoder to 1 input of the Spindelspeed

i do not know witch pannel you use, i am using GMOCAPY

there i have addid following rul in de post gui hal file

net CPenc-01 => gmoccapy.spindle.spindle-override.counts
i think trher is a same art pin in Axis

In the meantime, I found the information I was looking for here : wiki.linuxcnc.org/cgi-bin/wiki.pl?Spindleoverride