Thanks for reaching out in the community! Unfortunately, Lucidchart does not currently support that formula. However, we are always looking for ways to improve our product. If you'd like to see this functionality added to Lucidchart in the future, please add your idea to our Feature Request Form.
You can find more information on how to use the formulas currently available in Lucidchart in this Help Center article.
Thanks and please let me know if you have additional questions!