Golang Plugin: Specify the build package path

Currently, Golang plugin creates the following line with the default settings:

 go install -p 2 -ldflags -linkmode=external ./...

As you can see from the code, the build packages path cannot be parameterized as it is hardcoded to ellipsis path (./...). How do we specify target packages so that we can build only the binaries we want to (without resorting to override-build of course)? An example use case would be:

 go install -p 2 -ldflags -linkmode=external .

which would only build the top level package and install the resulting binary.