There are likely many ways to invision calling between commands within a runfile.

While the nuances of a built-in syntax are being considered, perhaps a simple addition would be to provide access to the Run binary and Runfile currently in use, allowing the user to invoke the runfile direclty within their command script.

Something like:

Runfile

## invokes test2
test1:
    ${RUN} -r ${RUNFILE} test2

## Printls Hello, world
test2:
    echo "Hello, world"