Multiple values for variations attributes

Hello,
When the product is a variation, the attributes don’t recognize the separator (|) when importing.
For example, I get 2 colors for a product. I put red|blue in var_color column as I did for simple product in pa_color column (it works).
The CSV saves one value and not 2 two distinct values. The output is “red|blue” instead of “red,blue”. As I’ve used “red”, “blue” for other products, I wouldn’t like another useless value “red|blue” .
Is there a way to fix this for variation add-on.
Regards.

https://ww.wp.xz.cn/plugins/woocommerce-csvimport/