is it possible to convert a string to number in DynamoDb PartiQL

Question

I am using the below query where minDaysToDeparture and maxDaysToDeparture are string but I have to put in the where block with comparison operators.

I have tried the below queries (not working):

SELECT * 
FROM Rules 
WHERE  ( 
AND (  minDaysToDeparture<='8' )  
AND (  maxDaysToDeparture>='8' )  
AND status = '1' )

SELECT * 
FROM Rules 
WHERE  ( 
AND (  '5'<='8' )  
AND (  '10'>='8' )  
AND status = '1' )

The below query works, but somehow I cannot change type of '8' it has to remain string. But if there is any toNumber method then I can use it without any issue.

SELECT * 
FROM Rules 
WHERE  ( 
AND (  5<=8 )  
AND (  10>=8 )  
AND status = '1' )

Looking forward to your help.

Thanks!