If you are using a type into activity you could send the hotkey through that. For example hot key “enter” is written as “[k(enter)]”, which could be added after your string. Unfortunately this requires that SimulateType is not activated, otherwise the hotkey will not be recognized and seems to work better with SendWindowMessages activated. I am unsure if that is feasible in your implementation, but this is another way to send hot keys
I see, you are trying to send the hotkey to the page, not into a text field, this might be more difficult then. However you could still try using something like this to send a hotkey through a type into activity and see if it works:
“[d(ctrl)]s[u(ctrl)]”
Where [d(ctrl)] is for pressing down ctrl, the followed by the secondary key, and finally the [u(ctrl)] is for the release of ctrl