Bulk add attribute value

Hi, is there a platform that supports bulk adding attribute values?
For example let's say you have a t-shirt shop and you have an attribute
"size" with values small, medium, large, xl. Let's say after your data entry
you decide to add xxl as an option, is there a way for that value to be added
to all the products that have the "size" attribute without adding it manually to
each product?

See original post by MichailV