Hi @suneelkumarc welcome to the Atlassian community.
I have found this "marketplace- numbered headings plugin" that might suit your requirement. please check or try free trial version.
The page tree macro does not currently have a formatting option that would allow you to customize the bullets that are displayed in front of the page names in the tree.
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If no heading style is applied to the page tree, it appears with bullets. If a heading style is selected for the page tree, the bullets are dropped. It would be nice if this were more consistent and we had a choice between bullets and numbers.
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