mic left and mic right to single TRRS mic

how to connect mic left and mic right to single TRRS mic connection. The first figure shows mic left and mic right connected to microphone output jack. I want to replace this output jack with the TRRS jack as shown in figure 2. the second figure shows Ring2 as the mic connection.

• so, you want to combine the left and right mic signals into a single mic signal (like might be used on a smartphone or tablet)? – Jasen Aug 26 '17 at 19:57

3-pin            4-pin