Thank you !!
This solution worked, now utag.link() call also, these evars/ probs set through plug-in are getting passed.
But, there is one catch, since we are using += in plug-in section for appending evars to s.linkTrackVars, this gets appends on every request and keeps growing with same eVar and Prop values
LinkTrackVars becomes "eVar31,eVar32,eVar62,prop65,eVar62,prop65,eVar62,prop65"
I'm not sure, whether we can set the s.linktrackvars to null (or '') in the plug-in section itself or using some other extension; if it can be done, in what order it should be set/ where, so that it doesn't override the linktrackvars created by Tealium on custom link calls.
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