You can use something like [https://github.com/kcrawford/dockutil](dockutil) to do that. That way you can position the dock icon exactly were you want it.

Depending on your exact needs you could run something like the below on an enrollment complete trigger.

dockutil --add "/Applications/Self Service.app" --after 'Finder' --allhomes --no-restart

Thanks Shaun,

I will take that onboard but hoping there is a more native solution that doesn't require me to run a script.

You could always use the built in functionality of the JSS, create a policy, and add a dock item on enrollment complete trigger.

Alternatively you can capture a "standard dock" with the exact layout you via Composer and then add the plist to user template.