Run project with arguments

When running a project it is often useful to specify arguments, i.e. argv.

I am unable to find documentation or a configuration option to do this.

example use case:

I can start the installed gnome-maps application with a geo uri:

gnome-maps geo:0,0

It is not possible to do this with Builder.

Failed hacks:

• editing the bwrap line and running that on the command line.
• editing the "command" key in org.gnome.Maps.json file in the project root causes execv error.
• lots of google searching and documentation reading.

I hope this feature exists and it is just missing from the documentation.