Warning about problems during code page conversion while uploading and downloading text data

Product: Zowe CLI, VS Code Extension for Zowe

Actor: User editing data from z/OS datasets, members, or UNIX files on a workstation and using a different encoding than IBM-1047 on the mainframe (e.g. IBM-870, IBM-037, IBM-273...) in the text mode Product download dataset or files in the text mode. The "Content-Type" allows specifying the client encoding (e.g. UTF-8). The z/OS encoding can be also changed by "X-IBM-Data-Type":text;fileEncoding=<codepage>.

If the data contain characters that are missing in the target encoding then these invalid characters are converted to "~" without any warning.
For example "Großrechner" in then it is converted to "Gro~rechner" in default IBM-1047 and the information is lost without knowing that this has happened and that a different code page needs to be used (e.g. IBM-273 in this case).

I would like to be receive information about problems with encoding conversion for these REST APIs:
- GET /zosmf/restfiles/ds/[-(<volser>)/]<data-set-name>[(<member-name>)]
- PUT /zosmf/restfiles/ds/[-(<volser>)/]<data-set-name>[(<member-name>)]
- GET /zosmf/restfiles/fs/<file-path-name> - PUT /zosmf/restfiles/fs/<filepath-name>

I would like to be able to specify a parameter that would modify the behavior and provide similar behavior like encode() function in Python https://docs.python.org/3/library/stdtypes.html#str.encode.