Create a GlobalCollection which contains all interface models which have 'trunking' set to yes .
Release : 20.2
Component : Spectrum Discovery & Modeling
(1) VNM -->Spectroserver Control -->VLAN configuration, set it to ENABLED
(2) On the selected device , in spotlight view, we can see the vlans, On selecting the vlan and clicking the "i" button , it will show the port view.
There is a column which says 'Trunking State' . use this value to know the trunk ports.
It's not achievable by any means through custom/OOB.