As Godot 4.0 with Vulkan gets closer, the developers have posted an update to clarify the direction that Godot 4 is taking for OpenGL ES. The renderer design and all resulting code has been re-implemented entirely from scratch in order to support Vulkan and modern rendering techniques. This will have taken close to three at the time of release. As such, OpenGL ES will not be supported in Godot 4. The goal is to support OpenGL ES 3 starting in Godot 4.1. There is more information which you can learn about from the Godot Engine team.