You can write the data and add a new tab by
using DataFrames
using XLSX
df = DataFrame(Name=["aaaa","bbbb","cccc"], Type = [1,2.0,5.5])
XLSX.openxlsx("MyXLfile.xlsx",mode="rw") do xf
XLSX.addsheet!(xf,"Required_tab")
sheet = xf["Required_tab"]
for r in 1:size(df,1), c in 1:size(df,2)
sheet[XLSX.CellRef(r , c )] = df[r,c]
end
end