How to set checked of a <vaadin-checkbox> with a variable?

I know I can do it with

<vaadin-checkbox checked>Option</vaadin-checkbox>

But it doesn’t depend on a variable.
I search for something like this:

<vaadin-checkbox checked=${this.myChecked}>Option</vaadin-checkbox>

Like it’s possible on a vaadin-text-field. The api says no. So is there maybe a workaround?

Sry, but I’m not very good at JS/TS. So I would appreciate any tip.

The dot before “checked”…

<vaadin-checkbox .checked=${this.myChecked}>Option</vaadin-checkbox>