Filter subgrid Inline Lookup View unsupported way

Hello all,

I had created "Circuit" Entity and added some records. I have also added the lookup of "Account". Then I added the "Circuit" subgrid in "Case"  Entity. Case also has "Customer(Account)" lookup. Now For adding the circuits in the subgrid I click "+" then magnifier icon, It is showing all the Circuits but my requirement is, only those Circuits should be displayed those are associated to the "Account" selected in "Case".  I think there are no Supported way to fullfill this requirement but what are the Unsupported ways? Is this possible to achieve this requirement? 

I think we can filter inline lookup for N:N relation but In my requirement there is 1 : N relation. For normal lookup we use addPreSearch and addCustomFilter but for subgrid Inline lookup how can we apply filter criteria?