Filter based on weight

Hello,

Log in to your WordPress dashboard and navigate to “Products” > “Attributes”.

Create a new attribute called “Weight”.

Add the weight terms as attributes options. For example, Save the changes.

Then go to Appearance > Widget > and add the woodmart woocommerce layered nav in the shop page widget area and select the attributes weight.
https://ibb.co/RNph0SJ

Please check this Manual:
https://xtemos.com/docs-topic/widgets-and-sidebars/

Best Regards