The others have addressed this accurately. There is essentially no way to realize the loss. In general, the loss in value simply means that you'll have less taxable income to report when eventually distributed.
If you made nondeductible contributions to your traditional IRAs, the deduction for unrecoverable basis that might occur if you receive distributions of all of your traditional IRAs is suspended until 2026, so you would have to wait until then to distribute the last of your traditional IRA funds to be able to claim that deduction, and only if the distribution then results in unrecoverable basis in nondeductible traditional IRA contributions.
