[Python] Disable font colour formatting for negetive values in python Polars generated excel

I would like to disable automatic font colouring of negetive values in polars write_excel. Any tip?

import polars as pl
import xlsxwriter

df2 = pl.DataFrame(data=np.random.randint(-10, 10, 5*3).reshape(-1, 3), schema=['x', 'y', 'z'])

with xlsxwriter.Workbook(r'_out_.xlsx') as workbook:
df2.write_excel(workbook=workbook, worksheet='sheet1',
autofit=True, table_style=None, column_formats=None,
conditional_formats=False, float_precision=0, sparklines=None, formulas=None)


This is what it generates -



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