Tablehead of dataframe - overline letters

Hello, I want to overline letters in the tablehead (top row) and row names (because I generally expressed averages in this way).
After hours and hours I didn´t find a way.
Can anyone help me?

We lead to know a bit more about of what you are doing.

We need a reproducible example (reprex)

A handy way to supply sample data is to use the dput() function. See ?dput. If you have a very large data set then something like head(dput(myfile), 100) will likely supply enough data for us to work with.

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