How to change the Variant Picker Style in Pipeline theme?

I have a client who wants to change the Variant Picker Style of the Sizes and Quantity options of their site into buttons.
Currently, it’s in dropdown style like this:

The problem is, their theme, Pipeline, has no variant picker style option when I customized it.
Unlike other themes, they have an option like this:

So, that it will be easier to convert the variant options to this:

Is there any way to add that option in the Customize Theme Menu? or do I have to code that function? I’m still a novice web programmer and I’m really hoping that someone would kindly help me with this. Thank you.

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