Delay chain as Macro

Hi,

I am looking for a delay chain using LCELL buffers.

module lcell_a ();

input x ;

output y ;

lcell lcell_1 (.in(x) , .out(a)) ;

lcell lcell_1 (.in(a) , .out(b)) ;

lcell lcell_1 (.in(b) , .out(c)) ;

lcell lcell_1 (.in(c) , .out(y)) ;

endmodule

The above mentioned logic should be made as macro and must have approx. delay for each Fitter run in any top level module used.

I do understand the PVT effects on LCELLs.

How can i implement the above mentioned on Quartus.

Regards