Hmmmmmmmmm.......ordinarily your head shadows the scope as you peer through the lens, which would preclude back-light glare. If the sun is off to the right or left side, and not directly behind, then I understand.
I do not know how a scope would counter this physical anomaly. A strong light source to the left or right and behind is going to cause glare on glass and illumination of the inner scope tube. How much glare will depend on the coatings on that glass.
Could you fashion some "sun block" behind you to prevent the light from directly impinging on the scope? It does not seem that much of a "screen" would be necessary. Perhaps the flared hood of a jacket or coat? Maybe a piece of plywood temporarily affixed to the stand? Or possibly a piece of camo draped down behind you and clothes pinned to screen your position? These would seem to be "easier" fixes for your issue.