A block with type HEADING_2. Used for medium headings.
Unique identifier for this block.
HEADING_2 Groups related blocks together. For standalone blocks, use the block's own uuid. For child blocks (e.g., dropdown options, multiple choice options), use the parent block's uuid so all children share the same groupUuid.
HEADING_2 Payload for HEADING_2 block type. Used for H2 headings.