Hi!
I don't know if this could be the best approach but I suggest you:
Before computing the frequency (e.g. Welch) or the main measure, set an Atlas and in the main computing screen select the scouts, in that way you can extract or export numerical values about measures, one per Scout.
In your case , you've already seen the activated areas, so you can just choose that Scouts for the main computation.
When you swith to source space and choose a measure (like Welch) , if you select an Scout Atlas, an option to select and compute the measure in specific scouts will be avaliable.
There is also an option with the right click: find max (in MRI viewer)
I hope it works
ps: don't worry, expert people like Francois will help you, I'm sure
