How to get the newly created value in the combo box

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Hi experts, My requirement: I need to create a new tag. So on clicking of create new tag, I have a popup where I create new tag. This tag while I create I want it to be automatically populated on the combo box where Select Tag is visible.  For example, the last widget Combo box is empty currently, I want it to have the value automatically populated with the value which i created for examle, tag test in new tag creation popup page. Please find the screenshot below. Help me with details please how can I achieve this.
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