Want to assign phone number one by one each new lead structure like round robbin

Hi, I already have a round-robin flow in one of my workspaces that assigns team members to leads. Now I want to use the same structure for assigning phone numbers instead of team members.

I have created a separate Phone Numbers app that contains all the phone numbers. My goal is to automatically assign these phone numbers one by one (round robin) to each new lead created in the Leads app.

Please provide me a step-by-step flow to set up this round-robin process so that every new lead gets the next available phone number from the Phone Numbers app in sequence.