[Feature Request] Support different connection character between instanceName and file suffix

[slhmy]

Is your feature request related to a problem? Please describe.
For json & yaml file, . will be better than _ to be the connection characer of the filename.
(Currently these files look like ${instanceName}_swagger.json)
I want files like ${instanceName}.swagger.json because they works better in VSCode with swagger extensions, files with .swagger.json or .swagger.yaml suffix can be automatically binded while _swagger.json or _swagger.yaml will not.

Describe the solution you'd like
An additional cli parameter to change connection character from _ to . .

Describe alternatives you've considered
Use . as the connection character for json and yaml files, continue using _ as the connection character for go files.

Additional context
😶‍🌫️ NOTING HERE...