I am not going to open that excel sheet, but I think it is much easier to simply enter the text into the sheet directly. That said, you can certainly import from excel into R directly using library readxl. See https://readxl.tidyverse.org/ for how to read and write data to excel formats and watch out for limitations (multiple sheets (works but need some additional commands) , macros, functions, ...) There is also an Excel import wizard in R-studio. Once the data is imported, you can change column names as you like. I am not 100% sure but I suspect that you will loose any formula and formatting contained in the original sheet.
Unless you want to further process the data in R it is too much overhead.