POST/PUT call in admin extensions

Hi, I’m currently working on an admin dashboard application based on Remix, which includes extensions such as block and action. I would like to make requests to my API routes from within the extension, and I’ve only managed to do so with a simple GET fetch. It’s as shown in this documentation (https://shopify.dev/docs/apps/admin/admin-actions-and-blocks/connect-extension-and-backend?extension=react). Instead of sending requests to the loader, I’d like to send them to an action at this path. Is that possible?