I am aware about the redstone signal comes from controller block when elevator is on the floor. (Output)

My suggestion is adding some way to call the elevator through a redstone signal. (Input)

Nice mod BTW. Thank you.

that should work if you apply a strong redstone signal to a call panel.

place a redstone repeater facing a face of a controller set to a call panel, then give it a signal, it should call it to that floor

I've tried that, maybe is the version:

Minecraft 1.12.2
Forge 14.23.5.2854
Thut Core 1.12.2-5.21.0
Thut's Elevators 1.12.2-6.1.6

Approaches

See if it works in 1.16.4-9.1.0, version 6.1.6 is something like a year and a half out of date

I see. I'm playing in 1.12.2 right now but I already know for future servers.