How to add reference field beforeInsert?

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I would like to be able to use the beforeInsert function as below, but I get the error

“Cannot set property ‘_id’ of undefined” for the multi reference field TicketTypes (ticketsAvailable works fine)

I have worked around it with the afterInsert function below, but would like a more elegant solution if possible. Thanks in advance.

export function OurEvents_beforeInsert(item, context) {
item.ticketsAvailable = 24 //works fine
item.TicketTypes._id = ['03dab1d8-099d-492b-b66a-f622c7d15c73'] //returns error
return item
}

export function OurEvents_afterInsert(item, context) {
wixData.insertReference("OurEvents", "TicketTypes", item._id, "03dab1d8-099d-492b-b66a-f622c7d15c73")
  .then( () => {
    console.log("Reference inserted");
  } )
  .catch( (error) => {
    console.log(error);
  } );
 return item
}