Buy Button SDK - Template {{ data }} not returning anything within Shopify pages

[jcdatudev]

1. I have this custom buy button script with the following template changes.

2. When this script is embedded anywhere else not Shopify, it is loading fine (Kindly focus on the SKU and Price in blue)

3. However, when embedded inside a Shopify theme/store, it seems like the {{ data.XXX }} are not returning anything. Everything is just blank

Can anyone help me fix this issue?