I am not aware if there is such a conversion connection.
As far I am aware of:
3.5mm jack = analog signal
coaxial = digital signal
So, basically is does not match.
From a laptop, you need to extract digital signal (via usb or optical or coaxial) and then you can feed this into the external DAC with its corresponding digital inputs (via usb or optical or coaxial). These are basic.
Hope this helps.
Sir, I am looking for this connection, 3.5 mm jack from laptop to coaxial para maikabit ko sa external DAC. What is your recommendation for this. Thanks