As a member of a club, every once in a while I see that the water of the pool (it's pretty big) is changed.
Can the water of the pool (chlorinated) be used to water the greens of the club (huge lawns), without harming the grass?

We put chemicals in pool water specifically to kill bacteria and algae. It will kill plants too. The plants can withstand some pool water as long as they also get some rain and other non-pool water, but if pool water is all they get, it will kill them.

It will kill the plants
but we can do the laundry and wash in it ,and wash the car
Plants hate chlorinated water
that was designed to kill organic development in the water to stop it from turning green with Algae

Yes, if used sparingly.
I recall a pool service once, while chlorinating a residential pool, created an explosion.
The chlorine caused all the vegetation in the yard to wither and appear dead. A settlement ensued, although being Fall, nothing was replanted.

The following Spring everything came back greener and healthier than ever.

Rarely does pool water need changed. Usually for repairs. Occasionally water must be added as a result of evaporation, but when kept properly chlorinated, the water will never become bad.

Your idea should be considered, although it would require some additional equipment to recycle.

No,you will kill the lawn.

The chlorine is there to kill stuff in the water, so what do you think?

Not only will it kill your plants, it's illegal because you're dumping harmful chemicals into the water supply. You could even kill fish in nearby streams.

(You can let it sit for a certain number of days - I don't know how many - without adding more chemicals and the chlorine will evaporate though. But you can't swim in it while you wait.)

no really harmful for the plants and the area you live

I had a leak from our splash pool last year and it killed much of the lawn - so I would say no! I can't believe there is anywhere in the UK needing to think about recycling swimming pool water to use to water anywhere at this moment in time!

I'm not sure ,but,chlorine might be toxic,and kill them.It can't be good for them.