Products Additional Information Plugin

Hello, I'm developing a plugin to include some additional information for products. This is the first time developing a plugin for NopCommerce and I'm following this guideline: https://docs.nopcommerce.com/developer/plugins/how-to-write-plugin_4.20.html However, I wonder if you could point me to something similar to what I'm trying to achieve in order to get some ideas/references.
Thanks in advance.

Something like this
https://www.nopcommerce.com/p/5828/ratings-reviews-scorecard.aspx
Or this
https://www.nopcommerce.com/p/5807/product-question.aspx

devotionsolutions wrote:

Have you looked at Product Specification Attributes?

New York wrote:
Yes and I'm using product specifications already. However, product specifications works fine if you need to select a value from a predefined list (like colors). But what I'm looking for* is something like an additional text property.

*or trying to develop

mhsjaber wrote:
These are really interesting extensions, but they don't solve what I need (see my previous response).
Thanks!