JsonMention

This type can contain the following fields:

field	type	info
`length`	int	The length of the mention represented in the message. Seems to always be 1 but included here in case that changes.
`start`	int	The number of characters in that the mention starts at. Note that due to a quirk of how signald encodes JSON, if this value is 0 (for example if the first character in the message is the mention) the field won’t show up.
`uuid`	String	The UUID of the account being mentioned

References