Theme Boundless is disable or add "soldout" to product variations

Store Design
1

I want to Sold out is disable or addclass add select option.

defalut
defalut658×792 25.9 KB

I want to Sold out is disable or addclass.
I want to Sold out is disable or addclass.666×716 22.8 KB

Left ：defalut.
Right ：soldout.