Ok, so after 3 days of looking, testing I'm not able to get what I want 
I'm looking a way to have in NPM the list of active VPN peers any Cisco ASA has at one particular moment, something similar to run the command show vpn-sessiondb l2l which output you can see below.
Session Type: LAN-to-LAN
Connection : 60.60.60.1
Index : 42 IP Addr : 60.60.60.1
Protocol : IKEv2 IPsec
Encryption : IKEv2: (1)AES256 IPsec: (2)AES256
Hashing : IKEv2: (1)SHA256 IPsec: (2)SHA256
Bytes Tx : 725455 Bytes Rx : 870198
Login Time : 12:39:31 CDT Thu Aug 11 2016
Duration : 1d 3h:41m:56s
Connection : 70.70.70.2
Index : 47 IP Addr : 70.70.70.2
Protocol : IKEv2 IPsecOverNatT
Encryption : IKEv2: (1)AES256 IPsecOverNatT: (1)AES256
Hashing : IKEv2: (1)SHA256 IPsecOverNatT: (1)SHA256
Bytes Tx : 2896 Bytes Rx : 2555
Login Time : 16:14:06 CDT Fri Aug 12 2016
Duration : 0h:07m:21s
So far I have found great documentation and templates but all of them provide just the total and not the actual peers, in the output above the template/pollers will return the number two (2) but not the IPs of the peers (60.60.60.1 & 70.70.70.2) in this case.
Any idea?
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Just for documentation, the best documentation I have found so far is:
https://thwack.solarwinds.com/docs/DOC-137039
