I think if you check with the truss engineer he's going to ask how much, what size, lb/ ft, etc. It's his truss system. Assuming new buildng and assuming you can find him.
If doing a remodel and you're adding any significant load to a truss, an engineer should take a look at it.
But as to bracing, that's permanent structural components of the building. A single pice of 3/4 emt - have at it.