Hi Ilya,
Netsight has a FlexView for Cisco VLANs. If you open the FlexView Database, and navigate to VLAN, there's a CiscoVLAN.tpl FlexView.
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And while it returns mostly interface information, If you select
Properties from the menu I showed in the first screenshot, you can edit it and add your own OIDs like Mike previously mentioned, OR, you could create an entirely new FlexView
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I hope is what you're asking to do.
All the best!