Question on custom layers

Hi,
I’m discovering the A&H world with my new CQ-20B (which I already love).
I would like to be able to easily adjust effects (reverb) for vocals. Is it possible, within a custom layer, to have something like this:
Vox 1 – Vox 1 FX – Vox 2 – Vox 2 FX?

Yes, the custom layer allows that

I’ve found how to add the whole FX volume on a layer, but not the level to send to FX for a specific input.
Can you please tell me how to do that?
There is definitely a learning curve, coming from Soundcraft

In Parallel mode, Each FX have 3 parameters:
-the FX send level witch control the overall signal level being fed into the FX Unit.
-the FX Level to LR. This controls the amount of ‘wet’ FX signal being
heard in the Main LR.
-the INPUT: adjust individual send levels to the FX Unit from each channel
This last one is also the controllable via the Fader in the fader screen.
The other 2 controls are to be set globally and are generally not meant to be control for individual channel.
But if you really need, to have fader control of the other 2 parameters, you would have to use specific midi control, external or via MS.

I would say that this is not possible.
The most you could do is “waste” a separate FX on each vocal:
Vox 1 – Vox 1 FX1 – Vox 2 – Vox 2 FX2.