ANSYS Workbench defining temperature dependent yield strength?

I'm running a simple steady-state thermal analysis as temperature input for a static structural analysis to find thermal stresses in my part. My goal is to review the FOS for this part.

As the material properties are temperature dependent, I've been able to define most of them fine, but am unable to do so for yield strength, as it only lets me enter a constant value. I've seen an older post recommend using Bilinear Isotropic Hardening to define this, but this doesn't then let me output the FOS for the analysis.

Any recommendations on how to get around this please?