Unfortunately no official free streams other than Free Practice 3 https://www.youtube.com/live/S87eZ1Sc7Tg

For those without access to the race broadcast the full races are normally placed the FIA WEC YouTube channel about a week or two after the race.

How to watch: https://www.fiawec.com/en/news/how-and-where-to-watch-fia-wec-6-hours-of-imola/7939