Personally, i remember dreams as i remember waking life. It's exactly the same vividness (unfortunately, mine is far below average on every modality).
The sad fact is that, due to lack of funds, we don't have any long term studies on "Can we improve vividness of our imagination or not ?", so the answer is unknown yet. The longest study i've seen lasted 2 weeks (i looked like 3-4 years ago).
But, drawing students report that learning to draw somehow helped them visualizing better, so... it wouldn't be weird if writing a journal/reading fiction with intent on visualization could help you visualize better.
And, my intuition tells me that vividness of your visualization is a deeply learned habit, it is not totally hardwired in your brain.
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