I've never used Sibelius, but I imagine its sounds can be triggered via midi.
No. Sibelius is a score publisher, with SOME sequencer features. MIDI input is on a single channel, for the purpose of capturing notation from a keyboard or other MIDI controller.
You COULD prepare MIDI tracks in Logic, export a MID file and open it in Sibelius. Then Rewire Sibelius' audio output back to Logic. But I think this is far from what's required here.
You don't have to write songs. The world doesn't want you to write songs. It would probably prefer it if you didn't. So write songs if you want to. Otherwise, dont. Go fishing instead.