Hi
You need create a new custom field at Spot module , by studio->Spots, then put that field at your Layouts like listview / editview.
Now you can put your data directly from views and if you want to get this data from any other module or sources, you need to create a before_retrieve logic hook and refill that value from source using $bean->field_name.
Please do not hesitate to reach me if you need any assistance!