Product category in the Title

Hello

I use Woocommerce and I want to add the Product Category of each product inside the Title of each product page, unfortunately it doesn’t work.

I tried different options:

%title% %sep% %term% %sitename%
doesn’t work, %term% stays empty

%title% %sep% %category% %sitename%
doesn’t work, %category% stays empty

The variable that should be the category is always empty

I also tried to select the category in my product page as the “main category” with the math rank radio button option, the math rank variable stays empty

Please how to show in my Product page title the category of the product?

Thank you