Asklemmy

Assuming you have a separate number for work:

Download shelter or island and create a work profile on your android device

Use your normal profile (and one instance of signal with personal number) for personal stuff

Use the work profile (second signal instance, work number) and separate contacts list for work

Link the work number/ signal to pc

I think you might be able to do this with two contacts apps.

For example simple contacts lets you have contacts that are local to the app. You could store all of the private contacts in simple contacts and the in your default contacts app hace only the ones you want signal (and other apps) to see.

Edit: I think I misunderstood you. If I understand correctly now, you want on your phone to have all contacts but on your work laptop only some contacts?

I am not aware of any way to do this, sorry.