Change text above cart button when item is out of stock

Store Design
1

Hi Community,

how can I change the Text above the atc button when selected size is not available? I use the Prestige Theme.

I added text above the atc button in the snippet → product-form.liquid but I need it variable when choosen size is out of stock.

{%- comment -%}

ADD TO CART BUTTON

{%- endcomment -%}

TEXT

Any help?