Hasura query that works similar to a SQL Left join - sql-server

Question

Assume the following SQL Server table structure
dbo.users
(
id int not null,
favoriteBook int null --fk
)
dbo.books
(
id int not null,
title nvarchar(max)
)
Assuming a user exists that has not entered in their favorite book I'd like to use Hasura's GraphQL engine to search for all users and return the title of their favorite book if one exists, or null if it doesn't.
I'd expect something like this to work:
query Users{
users {
id
FavoriteBook {
title
}
}
}
However when using this query the engine returns the following error:
{
"errors": [
{
"extensions": {
"internal": {
"tag": "unsuccessful_return_code",
"contents": [
"odbc_SQLExecDirectW",
-1,
"[Microsoft][ODBC Driver 17 for SQL Server][SQL Server]JSON text is not properly formatted. Unexpected character '.' is found at position 4.[Microsoft][ODBC Driver 17 for SQL Server][SQL Server]JSON text is not properly formatted. Unexpected character '.' is found at position 4."
]
},
"path": "$",
"code": "unexpected"
},
"message": "sql server exception"
}
]
}
The SQL generated by Hasura looks something like this:
select
isnull (
(
select
[t_Users1].[id] as [id]
,json_query ( [or_books1].[json] ) as [FavoriteBook]
from [dbo].[users] as [t_Users1]
outer apply
(
select
isnull ((
select
[t_Books1].[id] as [id]
from [dbo].[books] as [t_Books1]
where
(([t_Books1].[id]) = ([t_Users1].[favoriteBook]))
for json path, include_null_values, without_array_wrapper
)
,'null'
)
) as [or_Booksr1]([json])
order by
(
select null
) /* ORDER BY is required for OFFSET */ offset 0 rows fetch next 1000 rows only
for json path, include_null_values
)
,'[]'
)
;
Ideally the output would look something like this:
{
"data": {
"users": [
{
"id": 254,
"favoriteBook": {
"id": 1,
"title": "book about foo"
}
},
{
"id": 892,
"favoriteBook": null
}
]
}
}