Currently, Product & Variants Options app can change the look & feel of your options by using the "Design Settings & Translation Texts" feature.
This feature is available to Advanced Plan ($10/month) app users.
With this feature, you can also customize option text styles (font size, text color, font weight) of Option title / Helptext / Option value.
Moreover, you can set the dimension of each option type (Textbox / Number field / Checkbox / Radio buton / Dropdown menu / Button / Swatches)