You won't find a real answer, as anyone who provides such doesn't know what they are talking about.. as the answer is... it depends (on more than you have posted)
A U-model CPU means ultra-low power CPU, usually in a thin & light laptop, subject to thermal-throtlling. So what research have you done on thermal throttling in your specific laptop? Yes, the answer will impact OBS settings you can use
And what about Operating System Optimization for an under-powered system (for real-time video encoding)?
my point is that there are a LOT of factors that will determine what will and won't work on your system
So, are there very knowledgeable folks here who might be able to get 1080p60 recording (so a SSD, right, not a HDD?) on a system such as yours, it is possible it will take a fair amount of OS and OBS expertise to pull that off (not my thing, I don't really know)
I suggest looking into QuickSync encoding options (and associated OBS settings) for the Intel GPU, and start testing