I find a way:
Create an Exchange account with domain: google and server: m.google.com
First it doesn't work, then, go to your account via another device, you should have received a mail saying a connexion attempt had been blocked, follow the setting link and allow connexion from less secure app (or something like that, I'm french, I don't exactly know the terms used in English).
Then it should work (I'm not sure, I had deleted my account before noticing the mail, then created it again, do that if it do not update).
BUT, it seems pictures don't load :/
I didn't succeed to make it work throught IMAP/POP, but someone could be better than me about that way.
Go to advanced configuration (the last one when creating a new account)
Select the second one, email on internet IMAP/POP
Enter your email adress
for user, same email adress
Choose the name you want to give to the account
Name used to send mail
Incoming mail adress: imap.google.com or pop.google.com (you should activate one of them in your gmail settings on the web)
select the type according to the one choose before
Outgoing mail adress: smtp.google.com
It should be working, with picture loading. But no calendar/contacts.