You should include the full amount of the excess 401(k) contribution $6,198. The withholding will be reported to you on a 2019 Form 1099-R.
Please note: There is currently an e-filing issue within TurboTax related to excess contributions so you will need to mail in your return. You can check out this TurboTax FAQ for more information: Excess 401(k) Contribution Preventing E-filing.
