is it possible to stream jiocinema in 4k on 1080p laptop display, like somehow my laptop plays 4k on 1080p laptop display youtube

It doesn't play actual 4k on a 1080p laptop, it downscales.

It might work if you connect your laptop to a external 4k display, other than that there is no way.

yeah a there is an way to stream 4k on web
https://www.reddit.com/r/JioCinema/comments/1ct464u/how_can_i_watch_contents_in_4k_on_my_laptop/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button

refer this post