Hi @ramsabi,
You could use the assignments collection from the trigger action to retrieved the assigned persons. However, this collection doesn't contain an e-mail. So, you would need an additional apply to each to loop through the ids and retrieve their e-mail addresses from Azure AD.
Below is an example of that approach.

1. Add an initialize variable after the Get User Profile (V2) action. Call it AssignedToMail and set the type to string.
2. Add a select. Use the assignments in the from. Use the UserId field in the Map.
item()?['userId']
3. Add an apply to each. Use the output in from the select.
4. Add a Get User within the Apply to each. Use the item() as the value.
5. Add an Append to String variable. Use the mail dynamic content field. Don't forget to add the ; at the end.
6. Use the AssignedToMail in your Send an email action (which should be outside the apply to each).