SEO, meta tags, view source, Google, etc

I’m successfully showing dynamic data in the meta tags (title, description, etc.) but when you view source on a page, you see the {{variable-code}} instead of the data. I’m concerned about the effect of this on Google and the other search engines.

Will they index the page correctly or use the {{variables}} instead? I need to improve the SEO on a Wappler-built site so need to establish this before progressing.