How to define Class Tables in an external dll?

[daybson]

I need to create my class in an external project, then import it in unity as a dll.
Like-> RPGSystem.dll (.net standard 2.0 dll)

Then I would like to use some of his classes like Character as a table in sqlite4unity.

If I import sqlite-net-pcl in my dll project, I can tag the classes like

class Character
{
[PrimaryKey]
public int Id {get;set;}
}

But Unity is not recognizing it to create the data table in SQLite...
The error message I got from Unity when I try to run, using the schema I said above:

"FileNotFoundException: Could not load file or assembly 'SQLite-net, Version=1.5.231.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies."