This isn’t really a good idea because then you’re putting all your eggs in one basket. The whole point of 2FA is that the second factor is in a separate location so if your first factor (password) gets compromised the second one (OTP code) still protects your account. If both factors are in one place you’re back to a single point of failure instead of 2, losing a key benefit of 2FA.
If you’re gonna do this, at the very least have 2FA with a security key on your bitwarden vault.