Hey @madhumita3,
A simple way to bold the last row of your table is to append <b> value </b> tags to the values. You can do this through the ‘String Manipulation’ node and join the tags on either side of the value. It is important to note you need to escape \<b> value \<\b> the tags so the ‘Table to HTML String’ node will not revert it back to normal.
Here is an example of what you can put in the ‘String Manipulation’ node:
join("\<b>" + $date$ + "\</b>")
Here is the result:
Here is how your sample workflow was modified:
Hope this addresses your issue.