Need help with Referenced Field/Array?

Hi, Trying to use a reference field from a collection.
It shows in the table element as I wanted, but then I have function that export this data to a text file.
The process is very easy, but I’m stuck in trying to the get value from the “coursename” that is from the reference collection (refEventName:). I pasted below where it’s showing I output the value to the console, but I unable to get the value out it.
Any help will be appreciated.

My Code:

function getCourseName(items) {

   console.log(items);  
 //let myscore = myitems.items[0];   

//let mycourse = myscore.refEventName.course;
const nameOnly = items.map(item => item.course);
console.log(nameOnly);
return [...new Set(nameOnly)];
 //return mycourse;

}

export function button1_click(event) {
 //Get items from Table element.
 let items = $w('#tblweekPlayers').rows;

    getCourseName(items);
    items = items.map(function (obj) {
 //only shows the columns that you want
 //console.log(obj);
 const coursename = getCourseName(obj)
 return { PlayerName: obj.player_name, GrossScore: obj.gross_score, NetScore: obj.net_score, Handicap: obj.handicap, EventID: obj.eventID, EventName: '' };

    });
}

Output from "console.log(items); " inside function getCourseName()

{…}
→ refEventName: {…}
_id:
“4b1a4f7c-adcf-44be-ba63-a4712f11d7b1”
_owner:
“68c05680-eea4-4b96-a070-5536ba1f4eba”
_createdDate:
“2020-06-28T15:55:36.743Z”
category_name:
“A”

The main question is how I can access the value that is inside the array refEventName: {…}?