Can I trigger a particular slide using OSC?

Yes, this is possible. In the control page, after you've published a project, look for the "OSC Mappings" button. There is one option there called "Set slide". You just need to send an OSC message with this address (e.g. "/slide"), and a one value (a float) specifying the slide index. 0.0 = first slide, 1.0 =.second slide, and so on.

See this page for all OSC control settings: https://guide.lightform.com/hc/en-us/articles/360047226113