This is an example of adding LINE to the social icons of the Shopify theme Dawn. LINE icon images cannot be monochrome, so it stands out, but you may want to replace it with a color that matches the Instagram or Facebook icons.
Add LINE icons to social icons in the Dawn theme
Setting Step 1: Add the schema to "setting_scheme.json" and the label to "ja.schema.json"
Setting Step 2: Modify "social-icon.liquid", "en.default.json", and "footer.liquid" and add a new "icon-line.svg"
