According to the dimension of your data, you have 2 possibilities:
JupyterLab built-in upload feature (file size < 15MB)
You can use the Upload button from the JupyterLab Files tab view (as showed in the above picture). This feature will allow you to upload a single. If you need to upload more than a file, you can create a compressed archive (tar, zip, etc...), then upload and decompress it later via Workspace Terminal.