How we can upload binary image in load issuetype avatar api in Forge

Hi,

I want to upload an image for a custom issue type that I’m creating in my Forge Custom UI app.
I’m using this endpoint in the Jira API: https://developer.atlassian.com/cloud/jira/platform/rest/v3/api-group-issue-types/#api-rest-api-3-issuetype-id-avatar2-post

In the official docs, I can’t find how to add the body of the request.