How to replace all the column errors of my source table starting from a specific column?

I have a power BI file which is being feeded by an Excel file.

When the table is loaded into the power BI one of the steps is to Replace Error Values to 'null' of all columns except the first two columns. The table of my Excel file may change over time having more or less columns but I want to apply this transformation for all the columns (except the first two) regardless of the size of the table.

How can I do this?

Thanks in advance!