I don't think it is easily possible.
Apps that do the exposure bracketing lack panorama. The Panorama App lacks exposure bracketing.
You could take several manual shots lengthwise of the subject and stitch them together manually on desktop software.
So moving left to right would be A-C and exposure under to over would be 1-3.
Then take shots A1, A2, A3, B1, B2, B3, C1, C2 & C3. Obviously this is tripod work.
Stitch together A1, B1, C1 then A2, B2, C2 and finally A3, B3, C3.... Then merge ABC1, ABC2, ABC3 for the HDR effect.
A lot of precise work involved, but that is one way you could accomplish the effect.