Inputting multiple notes via the1-8 buttons

First post here. Really enjoying my Hermod, but I’m running into a “thing I want, but cant find a way to do it”.
I’m not sure if there’s any documentation on this but I cant seem to find it.
In step mode I’m trying to input more than one one event at the same time but on different notes (to send midi to an external drum machine).

Occasionally in the step mode window where the note name is, there’s 2 quarter notes (above each other) to signal that I can use two notes at the same time. I can input 2 notes at the same time using an external keyboard but I want to do it using the 1-8 keys on the front panel.
Is there a way to do this?

Thanks in advance