Update from @Vaclav at BT:
The closest proxy [in tallyLCA] is Engineered stone tile, with 15% epoxy and 85% fillers. Some of the resinous flooring may have more epoxy, I see examples of ~25%, so it’s not an exact representation but for now that’s the best I can recommend. We do have this on our list of materials to be added/refined.
Engineered stone tile is located under “Finishes > Tile > Stone Tile” and then is in a dropdown within the “stone tile” definition.