I can't find the model number that you gave. I did find other GE XL44 ranges.
Near the gas regulator of the range, there should be a conversion kit. You'll need to pull the range away from the wall to find the kit. Turn the gas shut-off to stop the gas flow and unplug the range for safety. The conversion kit includes the instructions for doing NG -> LP and back. The pictures here, https://www.appliancepartspros.com/door-drawer-parts-for-ge-jgbs20bea1ad.html
, may help you find the gas line parts.
There are a number of steps for the conversion. First, you need to flip a cap in the range's regulator. (When sold, the part is set for NG. You take it out and replace it after flipping it over (180) for LP.)
For the stove top, take off the burner grates and burners.
Next, you have to remove each burner orifice spuds (7 mm nut driver, IIRC) one at a time. Place the appropriate replacement orifice in that location. The orifice spuds are below the range surface so avoid dropping the parts. Each orifice spud has a letter with a different set of letters used for the NG and LP versions.
Inside the oven, you need to access the oven orifice spud. This requires taking off panels inside the oven. Replace the orifice spud, as with the surface burners. You'll also need to adjust the air flow for the oven.
Finally, turn the gas shut-off valve to on and plug in the power cord. Test the burners and adjust them following the directions in the instructions.
There is a blurb about finding the conversion kit and instructions on page 42 of the user's guide, available on the product page: https://www.geappliances.com/appliance/GE-30-Free-Standing-XL44-Standard-Clean-Gas-Range-JGBS20BEAAD
. The current link to the manual is https://products.geappliances.com/MarketingObjectRetrieval/Dispatcher?RequestType=PDF&Name=49-85135.PDF
I hope this helps.
(Since LP and NG pressures are very different, I hope your range was already converted to the LP regulator and orifice studs. Then all you just need to adjust the air/gas ratio to get a blue flame.)