Hi Aman,
Both questions seems to be about needing to change paramters of the host device which isnt accessible directly via nebula but can be achived by running a service inside a container (which in turn is managed by Nebula) that makes the reuqest to a mounted volume with access to the correct host file.
So in your examples that would be starting a container that mounts the docker unix socketfile and updates the nebula manager container or a container that mounts the host OS crontab file/folder and edit that... Another option is to use Nebula built in cron job to start a container that does whatever you want the host OS cron to do instead.