Bulk upload using excel and write to records

Hi All. I hope all are doing good. I have a scenario and for that i need an idea on how to execute it. 

I have an excel sheet with data. I upload the excel sheet and fetch the data using expression rule and write it to records.

Here the output of expression is - List of dictionary :  Item 1 -  a:{ data in it } b: { data in it } ; item 2 - a:{ data in it } b: { data in it }.etc............

Here the data in "a" should be stored to a record and the data in "b" should be stored to b record.

Any ideas please let me know. Thank you in advance.

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