The best way for us to use taxes in Stripe is with the "Automatically calculate tax" feature. It show up the right way for the customer and it works like a charm.
➕ Add a toggle button in the product if it is synced with Stripe "Automatically calculate tax"
➕ Add a toggle button to set this as a default for all Stripe products.
➕ Have the automatically calculated tax from Stripe show up in the GHL taxes list.
Her is the API: