Generating Emails Based On Form Responses

We have been using an MS Form in MS Teams to track when people come and go into the office.  One of the requirements is to email each person's supervisor when they fill out the form.

I have set up a 'flow' using MS Power Automate to send a formatted email, but it goes to me only.

One of the questions I have in the form is a drop down selection for the supervisor.

I'd like to have the system automatically email the supervisor, rather than me.  So far, there are two ways that I can see to do this;

1. Have a second drop down menu to select the supervisor's email
2. A huge batch of IF/THEN statements in the Power Automate.

I am thinking that there should be a way to select one item on a drop down list, that automatically selects another item on another list -- maybe a hidden list... so it automatically selects the correct email address based on the supervisor selected?

Otherwise, I'm going to have to try to figure out a better way to generate the email address in Power Automate?

Thanks in advance.

Greg