Is there a command line option to open a terminal in a split

Hello, terminator team

Looking at man terminator I see I can do terminator --new-tab, I am looking for something equivalent that would split the current terminal vertically or horizontally, I am not looking for the shortcut as I want to integrate this in a shell script.

For instance on tilix you can do (bellow is from man tilix)
-a --action=ACTION_NAME
       Perform an action in the current Tilix instance, the following actions are supported:
       session-add-right Adds a new terminal to the right of the current terminal.
       session-add-down Adds a new terminal down from the current terminal.

Is there something to do this ?
If not, would that be difficult to add ?
That would make a big difference to me.

Many thanks for this great tool