How to check for row lock level when FOR UPDATE is used in PostgreSQL?

Related to previous question here

From the pg_locks documentation, row level lock information is not available when FOR UPDATE is used in a SELECT statement.

Is there any way to check for row level lock when FOR UPDATE is used in a SELECT statement?
If yes, how can I do so with Postgres 11?

Thank you

Row locks are not permanently stored in the shared lock table, but on the row itself, so you cannot simply query for them.

To figure out which rows in a table are locked by concurrent transactions, you could run

SELECT id FROM mytable
WHERE id NOT IN (SELECT id FROM mytable
                 FOR UPDATE SKIP LOCKED);

StackExchange Database Administrators Q#282736, answer score: 5