Sulfur Lamp [Dynamic lights]

The Sulfur Cube has an interesting mechanic, but it's limited to multiplayer minigames.

My idea is to give this mob a real purpose and, while I’m at it, add a feature that was included in this year’s April Fools’ update—one that the community has been constantly asking for: dynamic lighting.
If you place a glowing block inside a sulfur cube (shroomlight, froglight, sea lantern, glowstone, or magma block), the sulfur cube should generate significant light, functioning as a portable light source.
For added convenience, a new feature could be added: the sulfur lamp. Using chains and lead, you could strap the sulfur cube to your back and carry it like a glowing backpack, ideal for exploring caves.