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As mentioned, PolynomialRing should work with your field.

Note though that the fact that you know it is a field is not the same as SageMath knows it is a field. And the second case is much more interesting of course, since then SageMath will provide you generic implementations for multivariate polynomial rings over fields (such as the "toy" Groebner basis algorithm).

To learn how to create some algebraic structure (with SageMath knowing its nature), you may begin with the thematic tutorial: How to implement new algebraic structures in Sage?