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Hello La DIGITEAM,

Happy to chime in!

You can use the 'Insert -> Shape -> Scribble' function to add irregular shapes to a Storyline 360 slide: 

These shapes can also have states which means that you can add any shape that you need to a slide to first your requirement. Here's an example of a regular shape, with an angled text box added to it: 

Let me know if this is what you were trying to add to your slide!