Welcome to the forums, BulletSpreader
Don't let the discussion discourage you. Making a pull request and getting feedback from the team is a great way to learn about Red Eclipse.
On topic, I don't know if exactly this feature would be very useful. However, there is already a similar gimmick built into the hint/glow/tone mechanics, but the variables are a tad confusing, so it is not well known how to make that setting a bit more visible. Actually, the glow (halo) effect you get on player models depends on their current health. So, you can already tell that a player with weak or absent glow has little health left.
The other aspect of your PR is a numeric value for enemy health stats. In my opinion, this is mainly interesting right when you got killed, and you want to know how close the encounter ended. But exactly this information is already shown in the system messages, along with a distance measure.
Concerning visible wounds on the model as a feature request, I don't think this will be very practical. I imagine such details would be hardly visible, and hard to distinguish from all the blood effects that are already triggered on hits and deaths.