There are plenty of great UX Hypothesis formats out there. They helped me get started in using them and I am a huge advocate in making them part of your design process. This is a format I came up with after using them that has worked great for me.
Customer Hypothesis
For [this type of users] who [have this need or are experiencing this problem], we believe [doing this in our product] will achieve [this outcome] and provide [this expected result as a way we can measure success]
Business Hypothesis
For [this department or company] who [has this business goal or are experiencing this problem], we believe [doing this in our product/creating this service] will achieve [this outcome] and provide [this expected result as a way we can measure success]
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leslie