@Adutiya I don’t think you can split imagination from perception, discernment and consciousness.
First the Buddha sees the rain drops- there is the object, the eye and eye consciousness- contact. Then he perceives them as rain drops (saññā), then sankhara and mind consciousness kicks in and he is able to create a story.
This is similar to the process in MN18 - except the Buddha stops at the point below, rather than making a personality out of it
Eye consciousness arises dependent on the eye and sights. The meeting of the three is contact. Contact is a condition for feeling. What you feel, you perceive. What you perceive, you think about. What you think about, you proliferate.
Hopefully I’m understanding you both.