There is not a method to directly upload values into the configuration of a custom field using an import file. You must use some intermediate feature.
The two intermediate features are the API, as suggested by @Marc -Devoteam- , or adding the values by importing issues that contain the values.
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Hi @Mar
Do you mean you want to add options to the field in bulk, not on the work items, but just the options,
check this API endpoint, https://developer.atlassian.com/cloud/jira/platform/rest/v3/api-group-issue-custom-field-options/#api-rest-api-3-field-fieldid-context-contextid-option-post
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