In Salesforce Flow Builder, create a "new resource".
Create a Task record. Example shown below. You can use "Allow multiple values".

If you want to setup a new Task, setup the below as follows:

In the UI, where you "Set Input Values for the Selected Action", you can assign the following:
For multiple Tasks, you can loop through tasks.
Below is an example Setup

Related to an Account is not yet supported. Contact us if you need to use this.
