Adding Classification Evaluation to Phoenix UI: Need Guidance

hi all, I have a super basic case where I want to add a classification evaluation to log evaluations in phoeinix. Every eval module in documentation uses LLM as a judge but my pipeline simply returns a class and I can just check if its same as my ground truth. and then I want to display if its the same in my phoenix UI. should be straightforward but docs did not help, any guidance how to do it?