Making one key write multiple characters

Hello.

I'm trying to make a single key write multiple characters. Example. If i press key, i would like that key to write "Hello". I have set up a hey that show "Hi" and its set to write "Hello", but when I press it it only writes the first letter H of Hello.

If this is possible please help me out. if its not possible on this version, ¿how can I implement this function on matchbox keyboard?

Thank you