How to calculate shipping charge line in order management a % of order total

Summary:

How to calculate shipping charge line in order management a % of order total?

E.g

Order amount 500

L1 100

L2 400

Let us now assume, the shipping charge % is 5 and the order should have a shipping charge line as 25 and total order amount will be 525

We have gone thorough several document and not able to achieve this. any input will be very much appreciated

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