In terms of counselling during the trial, you're right: we don't want to have someone potentially biasing jurors. What we can do first of all is the education, and we can normalize some of their reactions.
People experience things and think they shouldn't because no one else seems to, and then they feel like an alien. It's about having to normalize that a lot of what they're thinking is normal, and it's also about helping them to incorporate some healthy coping skills, even just things like deep breathing, telling themselves it's okay, and letting themselves engage in some self-care and trying to relax a bit. Things like that I know sound very obvious, but people don't see them in the middle of such a stressful circumstance, and they think, “This shouldn't be affecting me.” It would be about focusing more on self-care and healthy coping during the trial.