In Gmail, how to quickly obtain different recipient email addresses from 2 or more email messages

In Gmail, if I have two separate emails sent to two different people,is there a way to quickly obtain the email addresses of these two people?

I'm asking for two as minimum example, but the idea is that such a method, should it exist, should also apply to as many email messages as desired.

i.e., I would like following work flow,

1. select email 1
2. select email 2
3. perform some kind of data-gathering function
4. obtain / export the following results:

• person_A@email.com
• person_B@another_email.com

(further clarification)Right now, if I want to get the same result as above, I would have to go into each email message and copy and paste the recipient email information, one at a time. However, it becomes time consuming to obtain this information across more emails (i.e.: 10 emails, 100 emails, etc.).