You can directly contribute only up to the annual limit, regardless of whether it's tax deductible or not. However you can contribute more under certain circumstances using what's often called a "mega backdoor Roth IRA conversion."
It goes like this:
You may be eligible to contribute to a 401k plan through your employer. That plan may offer "after tax" contributions in addition to both "traditional" and "Roth" contributions.
That plan may also offer in-plan Roth conversion of your after-tax contributions.
Finally, you can roll over that after tax in-plan conversion Roth 401k into a Roth IRA.
Doing this it's theoretically possible to contribute more. In 2021, for example, the maximum 401k contribution from all sources is $58k. Following this mega backdoor strategy could allow you tens of thousands more per year in a Roth IRA.