ENGL101 Exemption by Portfolio Review

I did the IB Diploma Programme in high school and am expecting to meet the minimum requirements of a score of 5 in IB English A LangLit and a B on the Extended Essay as specified here: https://www.english.umd.edu/academics/academicwriting/exemptions/portfolio

Does anyone have any experience exempting ENGL101 with a portfolio review, specifically with the IB Diploma?
What sort of things did you write in the cover letter, and how much did you write? Thanks in advance!