Extra data from the SNMP poll like Backplane, PSU etc.

After we ran an autodiscovery fo a couple of our Juniper EX-series switches, we found that device42 didn't poll the information about Routing Engine, Backplane, PSU and SFP. So there is a question: is there a way to load Juniper (or other vendor) MIBs and to describe the information we want to get? At the moment we use Juniper EX4200, EX4500, EX8200 switches and MX80 and MX480 routers and SRX3600 firewall.