How can I add fields to multi field without writing a custom JS xtype . Just addition under fieldConfig node and it should be added to multi field ?

[KaushikNitin]

Hi , 

Each time i have to create a custom xtype whenever i need to create a multi filed with more than one field and their values got stored using some separator .

I am feeling it a bit iterative for each new requirement .

Is there a solution so that i will just add a node under fieldConfig and it should get added to multi filed and value for this filed will be saved as separate node in crx.