Pandas DataFrame to Excel cell alignment

I noticed that for string in Dataframe will keep left align in Excel and for numerical value will keep right align in Excel.

How do we set the desired alignment we wanted when exporting DataFrame to Excel? Example: Center Alignment

df = pd.DataFrame({"colname1": ["a","b","c","d"], "colname2": [1,2,3,4]})

with pd.ExcelWriter("test.xlsx") as writer:
    df.to_excel(
        writer,
        index=False,
        header=False,
    )

from Pandas DataFrame to Excel cell alignment