Product page repeater filter

Hello everyone,

I have added repeater (with colours database) below the product box on product page.


Now I would like to filter this repeater it so it will only display colours relevant to currently displayed above item on product page.

As a reference I have used SKU, so if in my colours database there is a reference that matches item SKU from non-editable WIX product database then it should display. But it doesn’t.

Have tried both Is, Contains and all other references. Have tried adding proper reference fiels - doesn’t work.

Ideally how I want it is this way (it doesn’t work):

The only way it works now is like this (but its not a solution):

Struggling for last few weeks to solve it.
Can anyone give me an idea what I have missed?

Thanks