actor / people nfo local

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EDIT: Disregard. You can also edit actors one actor at a time. Not sure where their data is held for easier editing.
Actor edit screen preview



Still leaving the below, even though I misread your post somehow.
You can manually add actors (People) one video at a time through the web http://localhost:8096/web/index.html#/metadata or whatever your server's URL is if you need to replace localhost, by selecting the video or media, and editing through the GUI screen or manually edit the nfo files. Below are four actors added to an episode of Two and a Half Men's NFO file I recorded OTA.

<actor>
    <name>Charlie Sheen</name>
    <role>Charlie Harper</role>
    <type>Actor</type>
    <sortorder>0</sortorder>
  </actor>
  <actor>
    <name>Jon Cryer</name>
    <role>Alan Harper</role>
    <type>Actor</type>
    <sortorder>1</sortorder>
  </actor>
  <actor>
    <name>Angus T. Jones</name>
    <role>Jake Harper</role>
    <type>Actor</type>
    <sortorder>2</sortorder>
  </actor>
  <actor>
    <name>Conchata Ferrell</name>
    <role>Berta</role>
    <type>Actor</type>
    <sortorder>3</sortorder>
  </actor>

Local .nfo metadata | Jellyfin

Sample NFO templates:  NFO files/Templates - Official Kodi Wiki

Thank you for your information but this is not what I am talking about at all.
I am not talking about the .nfo for the movie like you explained above.

What I am talking about is when you go to a move and the movie's .nfo file has a cast and crew. (the actors/people in the movie)
When you click on the image of a actor/person and it takes you to the Bio of that actor/person... how do I add/edit that information?
(pics attached)