how can I add a custom color for a variant color swatches for example 'mustard' ?

i’m using this theme https://dt-koka.myshopify.com/ and i want to add a custom variant pill color for example “mustard”. how can I do this in code, without adding any app from the shopify app store?

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i dont have any file name “product.liquid” :confused: I also looked in the files have a similar name and I didn’t find anything.
I want the custom color swatches to be seen in the product page of any product and also for example in the home page when i use a section that shows some products with the differents color variants (from there is the picture of my first post)

i send you a message with the code.