Nevermind this... I just decided to look in the database. If anyone finds this (and I've seen a few posts like this with no responses), just do this.

And yes I know... bad things to run mysql as root, but here it is anyway...

On your JSS, navigate to the mysql/bin directory and run:
./mysql -u root -p.

In my JumpStart, the root password was left blank. In this case simply hit return to get to a mysql prompt.

Next we’ll need to tell mysql which database we want to use. Type this and hit return:
USE jamfsoftware;

Running from the mysql prompt shows the fields we can select:
SHOW COLUMNS FROM mobile_devices_denormalized FROM jamfsoftware;

You'll see a list of all fields.... I'm just using username and imei in this example.

Run from the mysql prompt:
SELECT md.username, md.imei FROM mobile_devices_denormalized AS md INTO OUTFILE '/Users/Shared/mobile.txt';

Now you have that data in a text file in the directory you specified.

@lashomb, you should also be able to do this via the API.

JAMF are advising against DB queries as they may change the tables, but the API should remain.

Thanks Ben.