In the past, we’ve tried adding PT on the back end or doubled the quantity (as suggested by the CLF users in the past) and incorporated into our concrete reinforcement Tally definitions. There’s also a steel, cable definition you could try using, but you’d need to add an accessory material to the slab and calculate the % volume or model an equivalent volume/length in Revit to capture it. I haven’t tried this method or know how the Tally cable impacts compare to real PT cabling, but it’s definitely on our list to look into!
Also, here is the original post where doubling the rebar was mentioned: https://community.carbonleadershipforum.org/t/epd-for-high-strength-post-tensioned-tendons/3102