I need show the gallery data based on the other SharePoint list

Roles sharepoint data

Example - 10 items there in the gallery
Condition 1-If 10 people are belongs from Region-Africa Country -blank() all the 10 people "Reviewer","Preparer" they can see the All Africa data
condition 2-If 5 people are belongs from Region-Africa Country -Madagascar all the 5 people "Reviewer","Preparer" they can see the Madagascar data not all the Africa details