I don't have access to LR, so I can't check for you, but from looking at this page, it appears that the data you're describing is not just a single item, but a combination of multiple tags. For example, given what that page says about "Quick Describe", I could list over a dozen possible tags where LR could read to get that info.
Your best bet is to use the command in exiftool FAQ #3 to figure out exactly which tags LR is reading to present that data to you.
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Does exiftool extrqct comments from the Quick Describe and Large Caption fields in Lightroom 5?
I don't have access to LR, so I can't check for you, but from looking at this page, it appears that the data you're describing is not just a single item, but a combination of multiple tags. For example, given what that page says about "Quick Describe", I could list over a dozen possible tags where LR could read to get that info.
Your best bet is to use the command in exiftool FAQ #3 to figure out exactly which tags LR is reading to present that data to you.