It is better not to use meta description for Subtitle, because it may dublicate content from article (see second paragparh). From Guideline https://instantview.telegram.org/checklist#3-1-general-properties : "The subtitle must be shown on IV page if a subtitle exists in the source."
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From Guideline https://instantview.telegram.org/checklist#3-1-general-properties :
"The subtitle must be shown on IV page if a subtitle exists in the source."