Hello @Frank Leon ,
Welcome to the community.
The built in Pie Chart gadget for the Dashboard does not allow you to specify a field for which the values should be totaled. The pie wedges are based on counts of issues that match the Statistic Type you specify.
It doesn't appear that there is a built in gadget to sum up a custom numeric field. There is a change request for that, and a suggestion for finding third party apps that could be added to your Jira instance in this post:
https://community.atlassian.com/t5/Jira-Software-questions/How-to-see-the-summed-up-value-for-a-custom-numeric-field-based/qaq-p/1749610
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