PREPARE TRANSACTION for specific transaction branch/session

Hi,
Could you kindly assist with the below two queries?

1) From the below Postgres logs, we would like to know whether there is a
way by which we could make Postgres to attach or execute the 'prepare
transaction <gtxnid>' calls invoked from a transaction manager’s
xa_prepare(), to the process or session that started the transaction i.e.
attach it to the session within the 'xa_start()' and 'xa_end()' calls below?

xa_start()

2022-01-18 17:48:26.067 UTC [21798] STATEMENT: BEGIN

2022-01-18 17:48:26.076 UTC [21798] LOG: statement: SELECT COUNT(*) FROM
table_1

2022-01-18 17:48:26.086 UTC [21798] LOG: statement: SELECT COUNT(*) FROM
table_2

2022-01-18 17:48:26.096 UTC [21798] LOG: statement: update table_3 set
col1 = 'test1' where col2 = 123

xa_end()

xa_prepare()

2022-01-18 17:48:26.108 UTC [21797] DEBUG: StartTransaction(1) name:
unnamed; blockState: DEFAULT; state: INPROGRESS, xid/subid/cid: 0/1/0

2022-01-18 17:48:26.108 UTC [21797] STATEMENT: PREPARE TRANSACTION
'transaction_name_1'

2022-01-18 17:48:26.108 UTC [21797] LOG: statement: PREPARE TRANSACTION
'transaction_name_1'

2022-01-18 17:48:26.108 UTC [21797] WARNING: there is no transaction in
progress

2022-01-18 17:48:26.108 UTC [21797] STATEMENT: PREPARE TRANSACTION
'transaction_name_1'

2022-01-18 17:48:26.108 UTC [21797] DEBUG: CommitTransaction(1) name:
unnamed; blockState: STARTED; state: INPROGRESS, xid/subid/cid: 0/1/0

2022-01-18 17:48:26.108 UTC [21797] STATEMENT: PREPARE TRANSACTION
'transaction_name_1'

2) We would also like to know whether PostgreSQL can participate as XA
resource manager with Tuxedo as Transaction Manager?

Thank you.