how can I use an AI generated voice as the voicemail greeting for my business number on iPhone 14 Pro?

I have a business number as a second number on my iPhone 14 Pro. I also have a terrible recorded voice, and would like something professional sounding when clients call and reach my voicemail. I have no friends who have this particular talent, so I was hoping to use an ai-generated voice. I've used my script on several ai programs, and have found a few that sound terrific. I just don't know how to upload them as my voicemail greeting. Ideas?