If you are using propane in your house for heating, cooking, etc. , then it would be possible to extend piping for a grill. Propane hose extensions are available.
While you might be able to use Natural Gas piped in from your house- the gas company and city/state are going to have some very strict codes and regulations about what kind of use you may have (such as commercial/retail use). Not to mention some hefty bills.
There are gas grill connection that can be used for your home some are bult into you gas range. but you can get gas grills and use them indores ot on your patieo.
Contact your town hall and ask if it would violate safety codes. Some towns allow it and some do not. Contact your propane gas company or a licensed gas fitter.
Plumbed outdoor gas grills exist. However, they often do not use propane. The natural gas piped to your home can be connected to a special type of outdoor gas grill.
