Set the Section Label based on a field value

SetSectionLabel.js

function onLoad() {
    Xrm.Page.getAttribute("address1_addresstypecode").fireOnChange();
    Xrm.Page.getAttribute("address2_addresstypecode").fireOnChange();
}

function addressType_onChange(executionContextObj) {
    const field = executionContextObj.getEventSource();

    const addressType = field.getText();

    if (addressType != null && addressType !== "") {
        field.controls.get(0).getParent().setLabel(addressType + " Address");
    }
}