Allow host variable for sql-json-path-expression in JSON_TABLE nested path clause

In most of the JSON functions, I can use a host variable for the sql-json-path-expression argument.

I cannot do that in a JSON_TABLE nested path clause, however. For consistency, I'd like to be able to use host variables for the sql-json-path-expression argument of nested path clauses.

Given the RPG code:

dcl-c $Ord '$.Orders.Order[*]';
dcl-c $Sec '$.Sections.OrderSection[*]';
dcl-c $Dtl '$.OrderLines.OrderLine[*]';
 ...
select * from json_table(:clob_Rsp, :$Ord  -- This is allowed    
                columns                                           
                (                                                 
                  "OrderID"     integer,                          
                  "OrderNum"    char(24),                         
                  "OrderType"   char(12),            
                  "Vendor"      char(24),                         
                  "CustID"      integer,                          
                  "Status"      char(12),                         
                  "TotalAmt"    decimal(13,2),                    
                  nested :$Sec columns -- this is NOT allowed, error "Token :                                        -- was not valid. Valid tokens:                                               -- <HEXSTRING> <CHARSTRING>                                                   -- <GHEXSTRING> <GRAPHSTRING>."                             
                  (                                               
                    "SectionNumber" integer,                      
                    "Section"       char(24),                     
                    nested '$.OrderLines.OrderLine[*]' columns -- This is                                                                    -- allowed
                    (                                             
                      "LineId"       integer,                     
                      "LineNum"      char(24),                    
                      "LineType"     char(12),                    
                      "LineStatus"   char(12),      
                      "PartNumber"   char(24),      
                      "Description"  char(50),      
                      "QtyReqd"      integer,       
                      "QtyRcvd"      integer,       
                      "QtyUom"       char(12),      
                      "ChgAmt"       decimal(13,2), 
                      "ChgUom"       char(12),      
                      "Taxable"      char(1)        
                    )                               
                  )                                 
                )                                   
              );