The chat log cannot track drop costs for mining (or crafting costs).
LBML does have the option to set up drop costs, but you need to input the total cost per drop first to track that.
Someday LBMl will also include claim TT to show you TT% return, but that's a ways out just due to time availability and keeping other core parts of the tool running smooth (especially prepping for UE5 possible changes). For now it's just easier to get your TT returns by monitoring your Items page or tracking what goes into/sold out of your storage on a spreadhseet.
