How to check if the data component of the mainhand item is {}?

<img width="1244" height="76" alt="Image" src="https://github.com/user-attachments/assets/4e17739d-836e-4683-93d1-23f55f442f8b" />

I tried using
`%checkitem_getinfo:mainhand_nbtstrings:components..minecraft:unbreakable={}%`
but it resulted in an error.