Helix doesn't need "Git integration", just use the following keymap.

[nikitarevenco]

1. install lazygit
2. add this to your configuration

[keys.normal]
C-g = [
    ":write-all", 
    ":new", 
    ":insert-output lazygit", 
    ":buffer-close!", 
    ":redraw", 
    ":reload-all"
]

Explanation

1. write-all: save all buffers so that the changes can be shown in lazygit and commited right away
2. new: create new empty buffer
3. insert-output lazygit: runs the lazygit command and inserts it's output into the new buffer
4. when you exit lazygit, buffer-close! will kill the previously empty buffer and send you pack to where you were previously
5. redraw is necessary to re-render the UI to show the buffers
6. reload-all because if e.g. you commit everything, helix will still show the symbols indicating that lines were changed / deleted on the left of the line numbers. This will prevent that