What process? (clear lens with metal inserts)

[Alin.]

Hi all,

I'm new here and this is my first thread.
I don't have molding experience but I am trying to find a process for molding an optically clear PC or PMMA lens with metal inserts. The objective is to achieve a flush surface with aesthetic seamless joints between metal inserts and the plastic lens which will be back-lit. The main issue is that I can't imagine how the small metal islands are kept in place (see attached image - example found on internet).
Does anyone have experience in this kind of application? Can anyone describe the process?
Any suggestion would be greatly appreciated.

Many thanks.