Shopify Brand Size Chart

I need a brand-specific size chart added to my Shopify fashion store and want it to appear directly on every product page. The goal is to let shoppers choose the right fit without leaving the product view, so the chart must load quickly, match my theme’s styling, and display cleanly on mobile and desktop.

Here’s what I expect:
• Build or format the brand-specific chart data (I’ll supply the figures if you give me a template).
• Embed the chart in the product page layout—code it or configure an app, whichever keeps the solution lightweight and easy for me to maintain.
• Make sure the pop-up or tab looks consistent with my current design and does not clash with any existing scripts.
• Provide a brief note or Loom walkthrough showing me how to add more brand charts later.

If you have recent Shopify Liquid or app-based size chart work in your portfolio, please mention it so I can see how you handle styling and responsiveness.