Allow Filtering nor working correctly

Hello,

i am trying to allow filtering for product specifications but I do not seem to work out the value it has to have on the xlsx file for it to check the "allow filtering" box after import, what is the correct value?

I've trie "True", "0", "1" and "ALLOW"

my file looks like this

I have the same problem!

"True", "0", "1"
These correct values.
Open the plugin configure page and enable debugging.
Try to import and check the plugin log file.