If you run:
jamf help install
these are the options for that command. What is the goal you are trying to accomplish? Policies work well for installing .pkgs
jamf help install Usage: jamf install -package <filename> -path <path to file> -target <volume> [-fut] [-feu] [-showProgress] -package The filename of the package that will be installed. -path The path to the package. This does not include the name of the package. -target The drive that the package will be installed to. -fut The Fill User Templates option takes any user data and populates the files to the user templates so any new user created on the system will have these files. -feu Fill Existing Users option takes any user data and populates the files to every user on the computer that has a home directory. -showProgress Displays the progress of the HTTP download and the progress of the installation process.