[Solved] add custom attribute to customer in graphql magento 2

prabhakaran7 Asks: add custom attribute to customer in graphql magento 2
my custom module

schema.graphql

Code:
input CustomerInput {
    sample_attribute: String @doc(description: "new attribute")
}

but not adding this attribute in customer mutation

magento 2 graphql

I created a custom attribute in Magento backend for Customers

sample_attribute

I tried this answer Answer

how I can solve this??

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