Correct. You’d have to build a sheet that specifies admins.
Name the columns Admin 1, Admin 2, etc. and populate those columns with email addresses. Glide will create an array column of these admins called Admin. Then you can create a filter that says if Admin is signed in user. You could get this to populate in every sheet of you create another column called IsAdmin and fill it with any string like “true” or “admin”. In your other sheets create a similar template column, then do a relation/lookup of the Admin column.