I think that there should be a option for a glowing texture layer for blocks, similar to the entity glowing layer that was added in 2020.3.
It would be useful for blocks that are like magma blocks or sea lanterns.
Also because if you set the block to have a light level, it only makes it have light, it does nothing for the texture, which makes it look weird because it looks dark even though it is the block that is giving off the light.
Please add this :)
There is no support for such a thing in MC at the moment. I would need to write new render system for MC blocks just to support this.
Somewhat related: https://www.minecraftforge.net/forum/topic/25176-glowing-effect-on-a-block/