Storing Private Keys w Vaultwarden

I am interested is using Vaultwarden to store private keys per userid. So the lookup key is userid and what is returned is the per user generated key (No I don’t plan to store them separately on the client). How can Vaultwarden be used for this purpose? Also I will be installing on Ubuntu Linux on my own server. Any suggestions for simple setup for this type of self hosting.

Is this thread of any help?

https://vaultwarden.discourse.group/t/api-basics-how-to-pull-a-password

I think there is always a local client of some form in the current architecture as there aren’t any documented APIs for queuing the remote server.