This will work I guess , although I would like the column at the beginning...

SELECT

distinct A.login_name Login, A.host_name 'Originating HostName',

DB_NAME(B.Database_ID) DBName, B.command,

A.program_name,

data_source as 'Linked Server Name'

FROM [linked].master.sys.dm_exec_sessions A

LEFT JOIN [linked].master.sys.dm_exec_requests B

ON A.session_id = B.session_id

LEFT JOIN (SELECT A.request_session_id SPID, B.blocking_session_id BlkBy

FROM [linked].master.sys.dm_tran_locks as A

INNER JOIN [linked].master.sys.dm_os_waiting_tasks

as B ON A.lock_owner_address = B.resource_address) C

ON A.Session_ID = C.SPID

OUTER APPLY master.sys.dm_exec_sql_text(sql_handle) D,

--Add column from target linked server

[linked].master.sys.servers