Compare when was last time cronjob run

Question

Background: I'm currently working alongside a FaaS provider that allows us to run in our app a Scheduled Trigger, basically it allows us to run a method on a schedule. The problem is they only give us 3 options: hour, week, year. That means that I can't run a method 4 times a day, 6 hours intervals.

I started thinking about implementing this logic with cron expression

const sixHourCron = new CronJob("0 */6 * * *", () => setScheduledTriggerInterval);

The function setScheduledTriggerInterval calls an api and verifies user status. This is also the function that gets called each hour by implementing the Scheduled Trigger as referred above. But I only want the function to run if it didn't run within the last 6 hours.

Is there a way of having something like this:

const setScheduledTriggerInterval = () => {
    //check last time function ran with global initialized crontime/cronjob?
    if 6 hours have passed
    run the job
    else return and do nothing
}

Note: I have to use the Scheduled Trigger functionality so timeout or intervals are unfortunately not an option