S.H.
Well, kids do not grow up, necessarily "learning' how to have 'conversations.' They are not taught, or are raised not to, or maybe raised not to have opinions or the ability to do so.
Learning to 'converse', is learned.
Some kids don't know how.
So this is the conundrum.
Or they think they will be 'wrong.'
From the time my kids were younger, I used to actually teach them how to 'converse' and have 'conversations' for example. It is just about sharing thoughts as well.
Just ask open ended questions. Leading questions. Not questions that are 'yes' or 'no' answers. Ask, what their thoughts are on it, and why. Emphasize that there is no right or wrong. It is just 'conversing.' Having ideas and thoughts about it. That each person is different.
Approach it like it is a "book club"..... not 'journaling' per say. So that they feel a sort of camaraderie about their book and their "book club."
all the best,
Susan