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How to use "IS NULL" and "IS NOT NULL" Operators in JSON API Collections?

I am creating an API with Conditions and Operators. For '=' and '<>' operators its working fine. But for "IS NULL" and "IS NOT NULL" operators the response is 400: Bad Request.

{{URL}}/jsonapi/node/CONTENT_TYPE?filter[filter1][condition][path]=TAXONOMY_FIELD.drupal_internal__tid&filter[filter1][condition][value]={{TID}}&filter[filter1][condition][operator]=IS NULL

Request:
enter image description here

Response:
The error says: Filters using the 'IS NULL' operator should not provide a value.
enter image description here

Should the operators be encoded ? If yes, then which encoding should be used and what is the encoded string for these operators ?

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How to use "IS NULL" and "IS NOT NULL" Operators in JSON API Collections?

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