Ancient Debris Rainbow Animation

As of my current knowledge, NeoForge doesn't have any native mods that add support for emissive textures.

As a work around you can use the following:

• Sinytra Connector
• Continuity
• Sodium (NeoForge Version) or Embeddium

Option 1 (Highly recommended)

• MoreMcmeta (Forge)
• MoreMcmeta Emissive Textures (Forge)

MoreMcmeta supports 1.16.5 and higher

Option 2 (Not recommended)

• OptiFine

Option 1 (Highly recommended)

• Continuity
• Sodium - (Not needed but I highly recommend this) 
• Indium - (Required if you're using Sodium)

Continuity is only available for 1.17.1 or higher

Continuity only supports Emissive textures on version 1.18.2 or higher

Option 2

• MoreMcmeta (Fabric)
• MoreMcmeta Emissive Textures (Fabric)

MoreMcmeta supports 1.16.5 and higher

Option 3 (Not recommended)

• OptiFine
• OptiFabric