Adam, first of all great thanks for your awesome (best of the best) procedure, I use it every day and my first recommendation during troubleshooting SQL Server - run sp_WhoIsActive.
Answer on your question: its your native parameter in stored procedure (see description below), I use latest version from your site Version 11.17
--Get additional non-performance-related information about the session or request
--text_size, language, date_format, date_first, quoted_identifier, arithabort, ansi_null_dflt_on,
--ansi_defaults, ansi_warnings, ansi_padding, ansi_nulls, concat_null_yields_null,
--transaction_isolation_level, lock_timeout, deadlock_priority, row_count, command_type
--If a SQL Agent job is running, an subnode called agent_info will be populated with some or all of
--the following: job_id, job_name, step_id, step_name, msdb_query_error (in the event of an error)
--If @get_task_info is set to 2 and a lock wait is detected, a subnode called block_info will be
--populated with some or all of the following: lock_type, database_name, object_id, file_id, hobt_id,
--applock_hash, metadata_resource, metadata_class_id, object_name, schema_name
@get_additional_info BIT = 0,
Also I really want to contribute some enchantments in your titanic work but unfortunately I didnt understand license options for this (can I or you deprecate any changes?). If you publish you procedure on Github with any license option (Brent Ozar and Ola Hallengren already did it) I think many people will contribute or just say you big thanks.
Once again - great thanks for your work!