Powershell | Delete lines from .txt after specific pattern

InputObject   : created_at : Tue Sep 24 02:31:26 +0000 2020
SideIndicator : =>

InputObject   : text       : CH#66551 by @Test: Testing this script to see if it works
SideIndicator : =>

InputObject   : created_at : Tue Sep 24 00:27:01 +0000 2020
SideIndicator : =>

InputObject   : text       : CH#34330 by Test: Fixed every thing that is able to breathe
SideIndicator : =>

InputObject   : created_at : Tue Sep 22 02:31:26 +0000 2020

InputObject   : text       : CH#66551 by @User2: Fixing stuff

InputObject   : created_at : Tue Sep 22 00:27:01 +0000 2020

InputObject   : text       : CH#34330 by User1: Seeing if it works

InputObject   : created_at : Mon Sep 21 15:54:20 +0000 2020

InputObject   : text       : CH#34294 by User1: Trying to find a workaround

InputObject   : created_at : Mon Sep 21 15:29:13 +0000 2020

InputObject   : text       : CH#34291 by User3: Doing something else

InputObject   : created_at : Mon Sep 21 15:03:15 +0000 2020

InputObject   : text       : CH#34286 by User3: Running around

InputObject   : 

InputObject   : 

I want to remove everything in this .txt-file that comes after the last "SideIndicator : =>". Really appreciate the help. Note: The formatting of the next if a bit off here. "SideIndicator : =>" is found directly under "InputObject" (like you see it when you do a comparison in powershell between 2 files)