Your question appears to be incorrect. Exempt supplies refer to transactions without a tax element, meaning no Input Tax Credit (ITC) is available. so there is no question of ineligible ITC on exempted supplies.
We have manufacturing exempted as well as taxable goods and we have not take ITC on inputs used in manufacturing exclusively exempted product so that ineligible ITC need to shown in GST return.
pl advice where to report in GST return 3b and annual return.