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It is not possible to restrict connections using a Mac address. This is because Mac addresses and IP addresses have different communication layers. Since you are accessing via the Internet, the remote side cannot know your MAC address.
thanks for comment. It is possible any solution to whitelist other than public IP ?
As per the other answer, you can't filter based on MAC address because MAC addresses are local to the network that the user is on and aren't transmitted beyond the boundary of the subnet (and that includes across the internet).
It's not clear from your question what you're trying to achieve - as in, what risk are you trying to mitigate?
In general, authentication to Workspaces using some multi-factor method is "good enough" because it allows users to connect regardless of source IP address but you're still assured that the user is who they say they are.
What you might look at is certificate based authentication but again it depends on what your security goals are.
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