Please see section 126.96.36.199.2 here: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v201/en/ans_mat/amp8sq21dldm.html%23matRIPtheory
Using the Hill's criteria is a isotropic elastic, anisotropic plastic strain model. You can add it to the BKIN model as you have shown; then the Hill's material model inputs are scale factors that define the yield strength in the differing directions.
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