How can I add specification attribute on one page when creating product?

Hi.

I use nopCommerce 4.50

I want to know if it is possible to edit \Areas\Admin\Views\Product\_CreateOrUpdate.SpecificationAttributes.cshtml and add product filters quickly on one page?

For example.
I have created Specification Attribute named "Country" (id=1)
Then in Country I created opions Russia (id=1) and Germany (id=551)
Allow Filtering (true)

How can I create quick form for adding such Specification Attribute?
Can you please give me code example for .cshtml file?

Thank you.