Not able to access the key value of a list in a twig file I'm trying to access the key of a list (Text) in a paragraph twig file

This is what I have in my list
small|Small Item 
big|Big Item

{{content.field_option.0['#context'].value}}
{% set value = content.field_option.0['#markup'] %}
{{ value }}


I always got the text. Small Item or Big Item. I would like to obtain small or big of course depending of the user selection.

I'm going to use this value as an HTML Class.

Thanks for your help
I changed the entity_view_display of my paragraph so that my field output the key, instead of the value. I was then able to access the key. I hope that helps?

I'm able to use this: content.field_button_chrome[0]['#markup']