As Julie S explained earlier,The year end value of your IRA is used on Form 8606 to calculate the taxable portion of an IRA distribution when there are nondeductible contributions in the account.
In your case, since there were no IRA distributions for which you would be issued the 1099r to calculate taxable income based on your ending IRA value, (you did "NOT" take nondeductible contributions- you only converted to Roth), there is nothing to report for the year end balance in your traditional IRA account and you may simply leave it blank.
Have a good evening.
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