Getting value from non Odoo variable

I'm making a Odoo module with Html, and I'm trying to get the value from a variable in my model. This variable is not a Odoo variable (like fields.Char,fields.Date,fields.Selection...). When I try to show this variable I'm getting an "field not exist" error. I want to know if is possible to retrieve the variable value and pass to a <h2> element in my view.