As long as you are creating a bespoke planet, make it the right size and the right distance from the right sized sun with the right gas mix and it is possible that a breathable atmosphere at a livable temperature will exist at an elevation so that the gas pressure is one atmosphere.

You can float at this pressure so yes it is possible.

You would have to deal with wind though but it may be possible with the correct gas mix, spin, solar distance etc that wind could be minimized. Gas giants (well at least the ones we know about) tend to be pretty stormy.