Why is my spark theme metafield not displaying for specific products?

[Chantelrudden]

I created a metafield for products called sizing chart, for the product 'copy of sophie dress'  only
i have the metafield pulling from a page but when i go to 'insert dynamic source ' its not there..

https://www.call2love.com/
PW: raczek77

[PaulNewton]

Text types of blocks only show dynamic sources that themselves are also text types.

A page is an object not simple text. 

If the metafield is a page reference you need to reference the metafield directly with liquid

i.e. {{ product.metafields.info.size_chart_page.value.handle}} ; adjust to need: namespace(.info) and key(.size_chart_page) and pages object property(.handle or .content or nothing at all)