The bank will not ask about the use of the cash obtained after cash installment, and it has no right to ask about it. You can do whatever you want.

cash installment, sometimes called cash withdrawal installment, is generally a kind of installment method in which the credit card holder applies or the issuing bank actively invites the cardholder to apply, and the credit limit in the cardholder's credit card is converted into cash, transferred to the designated debit card (the bank or other banks) and returned in a specified number of monthly installments.