Assuming that you know how to edit a custom node and a phyton script, here is the screenshot for the bit that must be added to the phyton script inside the BB “Write Excel” custom node (you only have to add the selected blue line):
If you don’t know how to edit a phyton script inside a custom node, please take some online videos like this one:
Please let me know how it worked for you. I could further assist with that.
All the best,
Lorenzo NEY