import { LightningElement, wire } from "lwc";

import getAccounts from "@salesforce/apex/MyCtrl.getAccounts";

export default class MyComponent extends LightningElement {

    @wire(getAccounts)
    accounts = [];
}

public with sharing class MyCtrl {

    @AuraEnabled(cacheable=true)
    public static List<Account> getAccounts() {
        try {
            return getViaCallout();
        }
        catch(Exception ex) {
            new ApplicationException().throwAuraHandled(ex);
        }

        return null;
    }
}