how to call outer chain variable declaration(not from file directly)

[zrwsmd]

i want to define a custom function block CacheFb1 at my st program var declaration,this custom function block is not define at st file,i should get this from another way like a json file(this custom function block actually is a library function written by my colleague,he can give to me by json format)

for var declaration at st program ,it seems easy to achieve by changing my langium rule,but if i want to call it inner vaiable(ccc for example) like below

i can not achieve it by override DefaultScopeProvider$getScope
so should i define $document property?maybe cache document?but it readonly property

[zrwsmd]

[msujew]

Hey @zrwsmd,

This will work as expected once you correctly implement loading of external data. See #1517 (comment).