CLI correct SQL query to update struct field

spacetime sql conquer-mmo "SELECT * FROM character_position"
WARNING: This command is UNSTABLE and subject to breaking changes.

 character_id | prev_map_id | last_move_time                   | location                                        | direction
--------------+-------------+----------------------------------+-------------------------------------------------+--------------
 1            | 1010        | 2026-03-01T11:21:18.924697+00:00 | (map_id = 1010, x = 61, y = 109, elevation = 0) | (south = ())

spacetime sql conquer-mmo "UPDATE character_position SET location = (1000, 61, 109, 0) WHERE character_id = 1"
WARNING: This command is UNSTABLE and subject to breaking changes.

Error: Unsupported column/variable assignment expression: (1000, 61, 109, 0)

i tired a lot of syntax but no luck!. the docs show this syntax but i cant understand how to make it work!:

UPDATE table SET [ '(' assignment { ',' assignment } ')' ] [ WHERE predicate ]

Start by reproducing the reported spacetime sql UPDATE command and trace the SQL UPDATE assignment handling for struct fields. Compare the documented assignment syntax with the accepted expression forms; done means the shown character_position update succeeds and the relevant regression behavior is covered.