Connecting to mysql targets

We’ve got our ssh targets set up and everything is working nicely with those. We are also looking into setting up mysql targets which are running on RDS.
Reading the documentation I understand that there is no built-in helper for mysql, or any other sql besides postgres.

I see that we can connect to mysql targets by using the -exec flag like this:
boundary connect -exec mysql -target-id ttcp_qwerty123 -- -h -P {{boundary.port}} -uadmin -p.

But we’d still need to manually enter the password for the db. In such case using Boundary kind of loses it’s meaning.

Is there a way we can pass the credentials automatically like with ssh keys? If not, are there any plans on making this possible and when approximately?
Also what are your plans on adding additional helpers for connecting to targets such as mysql, redis etc?