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You can then set the value of your field to that cookie value:
document.querySelector("[data-category='Something']").value = getCookie("Something");
Change out the name of your field category and cookie.
This talks a bit about how it can be done server side: https://our.umbraco.com/packages/backoffice-extensions/formulate/formulate-questions/87639-no-code-generate-by-hidden-field
And if you are still using the AngularJS template: https://our.umbraco.com/packages/backoffice-extensions/formulate/formulate-questions/93777-formulate-set-hidden-field
The answer is in the question. Just posting this as the answer so I can mark it as solved.
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