Replacement front wheel for Fastroad SL-1 2019
Giant tends to use its own branded rather than 'name brand' components.
If you bike store thinks they cannot get a replacement wheel from Giant I'd try contacting Giant customer support yourself. It seems unlikely that Giant cannot provide a replacement wheel for a recent bike model.
If you cannot obtain a replacement Giant wheel, obtaining a replacement that is identical in specifications and similar in appearance should be easy. 28 spoke front wheels certainly are available (and that's not a particularly low spoke count). 'ETRTO 622x17' is the specification for rim diameter and internal width in millimeters. 622mm diameter wheels are also known as '700c'. I think from the FastRoad SL-1 webpage the hubs are quick release rather than through-axle. The other specification needed is whether you have 6-bolt brake rotor mount or Shimano center-lock.