provide git_root from cmd line

Let's say I have 2 projects -
~/code/repo1
~/code/repo2

I open nvim in ~/code/repo1 and want to see diff in ~/code/repo2.
Is there an way to provide cwd to codediff?
```
:CodeDiff --cwd=~/code/repo2
:CodeDiff --cwd=~/code/repo2 history
:CodeDiff --cwd=~/code/repo2 history <commit_hash>
```