External GPS antenna

Hello
I would like to know if an external GPS antenna can be connected to the MATRICE 210 and MATRICE 600.( Not of DJI necessarily)
In addition is it possible to find the communication protocol (Port connection) which comes from the GPS antenna to the drone?
In the MATRICE 210 from the external GPS antenna to the EXT panal
And in MATRICE 600 from the general antennas to the A3