Crop Sprayer on rover 4.0?

Hello, I am making a rover for agriculture as a project, I have a question I saw in the ardupilot documentation that a Crop Sprayer can be put in the copter, I would like to know if this function can be used in rover 4.0 or is not implemented yet, as well know if it is possible to read the amount of chemical in the container.

thanks foro you help

Yes, it is all possible in the not-yet-released 4.1.0-dev (aka latest) version.