No support of .TMX as of yet.
Network support is definitely on the road map (HTTP/GET and HTTP/POST).
With regards to .JSON, Ruby dictionary objects are essentially JSON (just save the file with a .rb extension . Here is an example:
# Dictionary object format one
SOME_COOL_DATA = {
item_1: 'value 1',
item_2: 'value 2'
}
puts SOME_COOL_DATA[:item_1]
# Dictionary object format two
SOME_OTHER_COOL_DATA {
"item_1" => "value 1",
"item_2" => "value 2"
}
puts SOME_OTHER_COOL_DATA["item_1"]