CellDecorator - any way to use a "None" - i.e. preserve formatting done in Excel already

Table 370 - gets the CellDecorator based on properties set around bold / underline etc..

Is there any way to ignore this... i.e... leave the cell decorated like it is ?

If not.. will rather write the sheet with openxml...

Have tried a default Decorator.. but the WriteSheet fails.

Decorator := Decorator.CellDecorator();

Any thoughts ?