Not sure how long you are in your dissociative recovery journey. I can appreciate your concerns about sharing these things with your partner.
One suggestion/idea I have is based on your comment that "this part has information, memories or wisdom for me in my healing."
What would happen if you flip the I pronouns and Jessie in that statement, something like - "I have information, memories, or wisdom for Jessie in Jessie's healing." Focusing on something like that might help move things out of stasis into progress.