How Can I Correct Skewed Photo?

When i take a foto from a picture with a frame (eg in a museum) it happens that during capturing the lens is not exactly on the level of the center of the picture. This skews the resulting photo. The corners are not square and the borders not parallel. Can I correct that with the Photos App?
In some cases I cropped the photo – deleting the picture frame, but in some cases i would prefer keeping the frame.
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Heinrich Fickler, Germany