Hugin does not generally let you enter known azimuth/elevation values for image points and solve orientation directly from that data. The practical way to correct pano orientation in Hugin is to use control points for perspective correction.

Per the PanoTools guidance, you can correct yaw, pitch, and roll by assigning:

• two horizontal control point pairs on different horizontal features, and
• two vertical control point pairs on different vertical features.

Then optimize for:

• yaw
• pitch
• roll
• optionally field of view

So if your goal is an accurately level horizon and correct overall orientation, use clearly identifiable horizontal and vertical structures in the images and optimize those parameters. If you specifically need absolute alignment to known azimuth/elevation coordinates, that likely falls outside Hugin’s normal control-point workflow and would require external calculation or scripting.