( I looked it up on the wiki, No help. )
.#1, Is it possible to load a table with data from Datastoring it?
.#2,Is it possible to upload a table into datastore?
1) It's possible, though there is a datastore query limit, which prevents large inputs. And even if it wasn't possible normally, you could use LoadLibrary'RbxUtility'.EncodeJSON
(deprecated) or game:service'HttpService':JSONEncode.
2) Yes, it is. I did it with Titan a long time ago. The only issue is that they have a limit. Also, no Instances of any kind. If you wish to upload instances as well inside the table, I would recommend looking at stravant's EncodeInstance module.
If you have anymore questions then go to the "Roblox Wiki" and type in "DataStore"!!
I hope this helped :D