Given an absolute path, line number, and column number, launch Visual Studio for Mac and go there.

LaunchVSMac.applescript

on run {filepath, linenumber, columnnumber}
	
	tell application "Visual Studio" to activate
	
	tell application "System Events"
		
		-- ⌘O File → Open...
		keystroke "o" using command down
		delay 1
		
		-- ⇧⌘G Goto file path
		keystroke "g" using {command down, shift down}
		delay 1
		
		-- type in filepath
		keystroke filepath
		delay 1
		
		-- ⏎
		key code 36
		delay 1
		
		-- ⏎
		key code 36
		delay 1
		
		-- ⌘L Search → Goto → Line...
		keystroke "l" using command down
		delay 1
		
		-- type in linenumber:columnnumber e.g. '17:11'
		keystroke linenumber
		key code 41 using shift down -- :
		keystroke columnnumber
		
		-- ⏎
		key code 36
	end tell
	
end run

This script mostly works, but is not ideal for obvious and less obvious reasons. Obviously, driving the UI with generated keystrokes is brittle, and will break under many circumstances. Non-obviously, the use of delay throughout doesn't work as expected. None of these delays appear to be lasting for a second. So sometimes, the operation seems to quit half-way through, or you end up typing the line and column numbers into the file that you opened. Even more odd, sometimes the ⌘G operation gets executed twice.

So use this at your own risk. If anyone comes up with a better way, please let me know.

With that said, I use this as an external tool in Jetbrains Rider. Here's how:

You can do the same thing in Visual Studio:

Unfortunately, you apparently can't use ~ or environment variables like $HOME in the command field.