Advise needed

I am looking to reduce my hours and go on a joint UC claim due to my own heath needs, however my partner is on New style JSA how would we go about and what is the best seamless way to go on a joint UC claim, would she need to cancell the JSA or would it automatically pick up, I do work fulltime at the moment but in desperate need to reduce my hours so I can focus on my health

Alternatively the job market needs to sort itself out so she can get a job 🤣

Thanks in advise all advise is appreciated