Hi , for your question here is my Answer check it out ,

“Hi [Boss’s Name], I wanted to have a quick conversation with you about an opportunity I’m really excited about. I’ve been thinking about my career growth and how I can contribute even more to our team. With the [specific position] opening up, I believe my experience in [mention relevant experience] and the successes we’ve had on [mention projects or tasks] position me well for this role. I’m really passionate about our work here, and I’d love your support as I pursue this opportunity. I’m also open to any feedback or advice you have for me.”