Would A Will Written In My Notes Hold Any Actual Power?

what the title says, if i write up a rough will in my notes app on my phone, would it actually hold up legally at all? i don’t plan on dying anytime soon, but i have a few medical conditions that can become very serious very quickly. i’m only in my twenties and i wasn’t sure if i was to write “this goes to this person” etc would actually hold any legal ground/my wishes would be followed were something to happen. i have my best friend set up as a legacy contact through apple, so i know she’ll have access to it. just curious, thank you