[[getResources? &parents=`[[*id]]` &tpl=`childItemRow` &depth=`0` &limit=`400` &includeTVs=`1` &includeTVList=`image` &includeContent=`1` &sortby=`{"publishedon":"ASC","menuindex":"ASC"}` &sortbyTV=`mytvfield` &sortdirTV=`DESC` ]]
This question has been answered by cristianb88. See the first response.
[[getResources? &parents=`[[*id]]` &tpl=`childItemRow` &depth=`0` &limit=`400` &includeTVs=`1` &includeTVList=`image` &includeContent=`1` &sortby=`{"mytvfield":"DESC","publishedon":"ASC","menuindex":"ASC"}` ]]
[[pdoResources? &parents=`[[*id]]` &tpl=`childItemRow` &depth=`0` &limit=`400` &includeTVs=`image,mytvfield` &includeContent=`1` &sortby=`{"mytvfield":"DESC","publishedon":"ASC","menuindex":"ASC"}` ]]