Bitwarden supports generation of Diceware/XKCD style passphrases thanks to this feature request. To comply with (questionable) password composition requirements of many websites, it allows adding a random digit. However, it will insert the digit at a random position, which adds an additional fact I have to memorize. On the plus side, it adds about 2 bits of entropy. But this entropy increase is downright ridiculous when the random digit itself adds 3 bits and each word adds about 12 bits (with the EFF word list used by Bitwarden).
Therefore, please allow adding the random digit at the end of the password instead of at a random position. Other generators such as batterystaple.pw or correcthorsebatterystaple.net support this. In fact, they don’t even have an option of randomizing the digit position.