Adding a custom Metafield in theme editor product page

Hi,

I am trying to add a collapsible row with a file in the row, basically a . PDF file with technical specifications in the row that customers can look at more detail spec, I am trying to use metafields to achieve this.

I have created the metafield and it shows up on the actual product input page, I can then upload my file to my product.

The issue is that in the theme editor when I click Dynamic Source, the metafield I created does not appear.

Is there a workaround, am I missing something or would I need to add custom liquid to acheive this,

I did try custom liquid by adding {{ custom.official_tech_specifications }} that ofcourse didnt work,

Please help

@Marco7777

can you please share store url and particular product page