Adding where clause after HANA placeholders in SQLAlchemy

Question

I'm trying to construct a query like this:

SELECT "Inventory".item_id, "Inventory".region
FROM "Inventory" ('PLACEHOLDER' = ('$$P_Param$$', '0')) 
WHERE "Inventory".region = :region_1 

My select statement is adding the HANA placeholders at the end though:

 select_stmt = select(
            inventory.item_id,
            inventory.region
        ).suffix_with(placeholders).where(inventory.region== 'USA')



SELECT "Inventory".item_id, "Inventory".region
FROM "Inventory" 
WHERE "Inventory".region = :region_1 ('PLACEHOLDER' = ('$$P_Param$$', '0')) 

How do I suffix the from clause with the placeholders and add the where clause afterwards?

class Inventory(Base):
    __tablename__ = 'Inventory'
    __table_args__ = {'schema': '_SYS_BIC'}

    date = Column(DateTime, primary_key=True)
    item_id = Column(Integer, primary_key=True)  
    region = Column(String)
    
    placeholder = "('PLACEHOLDER' = ('$$P_Param$$', '0'))"