Looking for a Free Tool to Generate Custom Vocals with Original Artist’s Voice

Hello,

I'm looking for a free tool that allows me to create a version of a well-known song where the original artist's voice sings new lyrics. Specifically, I would like to use the melody of “The World’s Greatest” by R. Kelly, but have R. Kelly's voice sing different lyrics that I provide.

Are there any free tools or platforms available that could help me achieve this?

Thank you in advance!

Best regards,