I want to express to an uninvolved person that I wish luck for some people involved in an endeavor.
I'm keen interested to watch the result and wish lucky for that.
Wish lucky for that or
I do wish them best of luck
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You could say I wish them luck on this project, or if you addressing them directly you could say I wish you luck on this project, or maybe I wish you and your team luck on this project if you are just addressing one member of the team. If you want to be less formal, or you want to say it shorter, you could say Good luck, guys!.
Saying "Good luck!" to someone else is largely just a set phrase anyway, and since OP says he's actually working with the team it doesn't really seem appropriate to say to someone else that he wishes them luck with the project. Apart from anything else, the team should be expecting the project to succeed because they do a good job, not because they're "lucky".
I suggest that if OP wishes to report his attitude towards the team/project to a third party, he should probably say something like...
...which could equally well apply if OP himself has no actual involvement with the project, or perhaps something like...
...if he personally is an active member of the team. There are plenty of alternatives, obviously. I myself would be likely to say I'm thoroughly committed to the success of this project.