Question Is there any way to make decals emissive in URP?

Yes, it is totally possible.

You may follow the decal shader graph manual: https://docs.unity3d.com/Packages/com.unity.render-pipelines.universal@14.0/manual/decal-shader.html to create your own decal shader or modify the existing decal shader. Remember to tick the "Affect Emission" checkbox and after that you can provide whatever input you like to the emission output.


Apply the shader to the decal projector, there goes the bloom.