On the RPI there should be a file put there by the build you did.
/usr/share/indi/indi_rolloffino.xml

I run Ekos and the drivers on the same computer and there I can see the driver. I am unsure whether if the above file was in an equivalent directory on your MAC if that would allow the rolloffino driver to be seen like those drivers provided by the normal install.

On the MAC in your Ekos profile, in addition to the drivers you use from the normal install try adding the rolloffino one using the remote specification.
Just below where you select the drivers is the Remote field showing the syntax to use. If you hover over that field it show some specific examples. You want to use the name of the driver in a quoted string where case and spaces are significant.
"RollOff ino"@rpi-host:port

indiserver needs to be running on the RPI for it to work, perhaps the use of INDI web manager will take care of that? Port can default to the indiserver's default of 7624

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