Yes. Open Doors is in the process of developing a formal Fannish Estate Plan for fans wishing to donate their collections after they pass, but in the meantime, we can help you with appropriate wording for a bequest. Please contact the Open Doors committee for assistance or further questions.
For questions about preserving your AO3 account in the event of your death or permanent incapacitation, please visit the Fannish Next-of-Kin FAQ on the AO3.