I reviewed your state law pertaining to this fee. You can find it here: https://www.in.gov/legislative/ic/archive/11620/ic/2010/title27/ar7/ch3.6.pdf. This is a unique fee since it is required by the state, but paid to the title insurance company which retains a portion and passes the remainder on to the state. Additionally, there is a disclosure requirement in the state statute.
With all this in mind and since they have probably already had this question arise, I suggest you contact Indiana’s Department of Financial Institutions for their advice on how you should disclose this fee on the integrated disclosures. Please let us know what you find out or if they aren’t able to help you.