Extract email address from people picker

XtatiK Do you just want to show the email in list view or store the value in column & use it somewhere else?

If you just want "display" value in list view, you can use JSON formatting on column like: 

{
   "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
   "elmType": "div",
   "txtContent": "[$PersonGroupCol.email]"
}

Output: 

If you want to store the value in column & use it somewhere else, you can create a power automate flow to update the Email address field based on the Person or Group field.

Check my answer given in this thread where I have explained same scenario in detail: Get Email from user and enter into SharePoint list field 

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