Router DX/EX 3300 series - config file

I'm trying to figure out where can I obtain the manual or something like that, that has the info about the config file structure in the CPE AX1800 "model attached below". When I log into the CPE\Router under the backup\restore function you can save the config file to local storage for lather use or if you want to quickly configure a new CPE\Router.

The file that you save is in a .JSON format, and is normally readable\editable you can make changes to it and when you restore it to the old\new CPE\Router in works, so you don't have to use the GUI interface. I know that this CPE\Router can be used ba a customer\business or even the ISP, because it is very versatile.

So my question is, does a document or something similar exist where all the functions are described what they do in the config file.
For example this is what the config file look's like, the entire config file has around 7k of lines in it:

_________________________________________

{
"Services":{
"VoiceService":[
{
"PhyInterface":[
{
"X_ZYXEL_Pound":true,
"X_ZYXEL_LineSelect":"Device.Services.VoiceService.1.VoiceProfile.1.Line.1",
"X_ZYXEL_PotsType":"",
"X_ZYXEL_DialingType":"",
"X_ZYXEL_DialToneType":"",
"X_ZYXEL_ReceiveToneType":"",
"X_ZYXEL_FlashMaxInterval":0,
"X_ZYXEL_FlashMinInterval":0,
"X_ZYXEL_JitterBufSize":0,
"X_ZYXEL_CallerIDType":"",
"X_ZYXEL_CallerIDPayload":"",
"X_ZYXEL_TasTimeoutInterval":0,
"X_ZYXEL_TasTimeoutInterval_2":0,
"X_ZYXEL_CallerIDRingTimeout":0,
"X_ZYXEL_FirstRingTimoutInterval":0,
"X_ZYXEL_FirstTASType":"",
"X_ZYXEL_SecondTASType":"",
"X_ZYXEL_CallerID_DTAS_ACK_Timeout":0,
"X_ZYXEL_MsnIncomingSelect":0,
"X_ZYXEL_MsnOutgoingSelect":0,
"X_ZYXEL_HowlerToneTimeout":0,
"X_ZYXEL_CID":{
},

_________________________________________

And i need to know what this options means. I know that some of them are self explementary but some of them are not.

https://store.zyxel.com/ex3300-t0-eu01v1f.html

https://store.zyxel.com/dx3300-t0-eu01v1f.html