Line break from input to Calender cell

I know there’s lots of into about line breaks but so far I’m not succeeding, which may be a limitation with the calendar plugin I’m using.

I have a form where the user chooses a team member for an event and I automatically add a customer to display with their post.

The save button looks like this;

Description = Parent group Job's Customer's first name, Parent group selected team member's first name

I would like this to display on the calendar on two lines;
Parent group Job's Customer's first name
Parent group selected team member's first name

The trouble is, I don’t have any control or access to the calendar cell because it’s a plugin.