Exporting the language property of styles to tagged PDF, possible?

Hi

I think I saw this question pop up by another user recently and I couldn't figure it out. 

The only place it shows up is here

Done by 

Seems whichever language I select here the 2 letter Country Code is added

et for Estonia

for GB it's EN-GB 

Presumee it could be EN-US if selected. 

Lanaguage appears to be a property for InDesign dictionary only - and can't be tagged per paragraph/characters for PDF taggings.

Appears to be a PDF addition of a Tag. 

When I look through the option in the PDF - Estonia is not even an option

Seems to be a limited set of languages.

I can type Estonia and it sticks

But it's not an option for individual paragraphs

I can add it to the entire article

Or select each individual paragraph in the tags and type in whatever I want