How to tell blueman to reconnect device at startup?

I have an up-to-date Debian Sid computer with Blutooth connected external speakers (Logitech MX Sound, if it matters).

They work very well and I have them paired and trusted.

Problem is they will not connect automatically at reboot.

I am forced to open Blueman, right click on the device and select “connect to Audio sink”, after that everything is working.

I know I can force connection with something like:

(sleep 5; echo "connect <MA:C_:AD:DR:ES:S_>\nquit" | bluetoothctl) & 

somewhere in my startups, but it seems strange (to me) there is no way to do this via the normal GUI.

Am I missing something?