Maya FBXImport replace certain string when importing FBX

Question

I'm trying to import FBX to apply its animations onto the rig already in the scene.

        options = "targetTime=3;option=insert;match=string;selected=childrenToo;search=XXX;replace={};".format(prefix)
        pm.mel.FBXImport(f=file_path,t=1,options=options)

File() works fine with this option. How can use this option with FBXImport? Thank you in advance.

Importing atom:

        options = "targetTime=3;option=insert;match=string;selected=childrenToo;search=XXX;replace={};".format(prefix)

        cmds.file(file_path, i=True, type="atomImport", options=options)

works fine.

Importing FBX:

        options = "targetTime=3;option=insert;match=string;selected=childrenToo;search=XXX;replace={};".format(prefix)
        pm.mel.FBXImport(f=file_path,t=1,options=options)

This doesn't.I'm trying to rename certain string when importing FBX.