I have used single line text, with list of values option, If its showing code instead of swatches then you might need some changes in your code, I can help you with If you need.

The built-in search and discovery app for Shopify 2.0 with the Dawn theme does not support color swatches in the filter options on the collection page. However, you can achieve this by adding metafield.Add color as a metafield and update values in pr...