How to include a text value if checkbox is ticked into E-mail subject line?

I'm a newcomer in the JS world and need to create a JS code for sending a form via E-Mail using an action button.

See code below, I moreover don't have a clue how to put a text value in the subject line if a checkbox is ticked.

E.g.:

"required" (checkbox 1)

"not required" (Checkbox 2)

--> C1 is ticked --> write "required" in the subject line

--> C2 is ticked --> write "nrequired" in the subject line

--> both are ticked --> write "required" // "nrequired"

var mySubject=this.getField("Company").value+"//"+this.getField("ObjNr").value+"//Invoice"+this.getField("iMS Number").value+"//"+  ????

var

body='Hallo DM-Team,\n\nanbei erhalten Sie den ausgefüllten Antrag zur Stammdatenänderung für Personen\nsowie die benötigten Anlagen.\n\nMit besten Grüßen,\n\n'+this.getField("MitarbeiterPM").value;

this.mailDoc(false,"masa@gmx.com","","",mySubject,body)

Merci!!!