How do I join my wife's existing sole Proprietorship to form qualified Joint Venture?

My spouse operates a Sole Proprietorship providing Technology/Software services and previously served as a Business Analyst on a 1099 basis. Although she has not actively worked for the past few years, the Sole Proprietorship remains open and holds a Fictitious Business Name (DBA). I am considering utilizing her Sole Proprietorship (DBA) for my 1099 work as I embark on an independent contractor opportunity. Are we eligible to be classified as a Qualified Joint Venture? Is there a need for my wife to make any adjustments to her Sole Proprietorship to include me as a Joint owner, or are there any specific filings required? What steps should we take next to establish a Qualified Joint Venture, enabling me to proceed with pursuing the independent contractor opportunity and filing annual taxes?