Lookup column which referecne a list on another site is not showing inside PowerApp
I have a site collection with this url /sites/t/ , and it has a list called CostCenter:-
and inside the /sites/t/ site collection >> i created a site column of type Lookup which reference the CostCenter list named CostCenterLookup, as follow:-
now i have a sub site at this url /t/en-ca/forms/ , which contains 2 lists; Devices + MobileSubmissions:-
now inside the MobileSubmissions lists i have defined 2 lookup fields:-
1) First lookup is the one defined on the root site and which reference the CostCenter list (as described above).
2) While the second Lookup is a list column (not site column) which reference the Devices list found on the /t/en-ca/forms/ subsite.
Now i created a new Canvas PowerApp, and i added the MobileSubmissions + Devices + CostCenter lists as the datasource >> then i added a new form and i defined the MobileSubmissions as the Data source >> where i get all the fields inside the form (Title + Lookup to the Devices list), But i did not get a field for the lookup column to the CostCenter, as follow:-
Can anyone advice on this please? is it limitation in power app for showing lookup fields which reference a list from another site? if the answer is Yes, then is there any workaround?