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How can I get my CustomAppointment field value on the client side to pass to my custom dialog form?

How can I get my CustomAppointment field (I'm using my custom data provider with my custom database), for example, "CustomerId" to pass to custom form?

Can we extend CSOM by adding our custom JS functions like getCustomerId here?

function WebScheduleInfo1_ActivityDialogOpening(oScheduleInfo, oEvent, oDialog, oActivity)


oEvent.cancel = true; //Cancel default form

var StartTime = oActivity.getStartDateTime()

var CustomerId = oActivity.getCustomerId()      //Get my CustomAppointment field "CustomerId" to pass to custom form

window.showModalDialog("CustomForm.aspx?CustomerId=" + CustomerId + "&StartTime=" + StartTime);