As of now, it is not common practice to include cryptocurrencies in traditional 401(k) plans offered by employers. However, there are self-directed 401(k) plans or Individual Retirement Accounts (IRAs) that allow you to invest in cryptocurrencies. You can explore setting up a self-directed retirement account through a custodian that allows cryptocurrency investments. Keep in mind that investing in cryptocurrencies can be risky due to their volatility, so make sure to do thorough research and consider consulting a financial advisor before making any investment decisions.