Suppose I have raised a flag and moderator has responded for that flag, accepted/declined it.

I am happy/not happy with their decision and would like to thank/explain the point to the moderator who responded for my flag.

Is there any way to do that?

I guess one problem is that there might be a very long discussion between the person who raised the flag and the moderator who responded (which might irritate the moderator). But otherwise, I do not see any problem and I think it is a good practice to do.

Do we have such opportunity?

I am not asking to reveal the identity of the moderator. It is not about the person but about the work.