It's not supported for Quick Actions as mentioned here. There's an idea to support this that I suggest voting on.
Unsupported Experiences and Tools
Lightning Web Components doesn’t currently support these Salesforce
experiences and tools. To use a Lightning web component with these
experiences and tools, wrap the component in an Aura component.
Quick action of type Task or Event appear under the Activity tab of the Lightning record page or under the Open Activities/Activities history related list.
Note that "Activities" component shows up only if the Activities View is set to Activity Timeline for the org or user.
More info about the activities view here