Parsing JSON into multiple rows

Im parsing the JSON from trello.  I would also like to extract custom fields.  I get to one point where the custom field data looks like this: (value in one row)

I would like to extract this into multiple rows:

I can use the normal expand - however that 'hardcodes' the field names into table column names.   I need to be able to refresh the data and no have the parsing fail with differeent field names.