How to update customfields of Asset Types using REST API

Hello,

I created some custom fields in the Asset Types as shown below


Now I need to update this custom field in the scheduler event. For this, I didn’t found an API to update Asset Type with custom fields. I went through the Rest API doc and I found an update API only with default fields Service Desk API for Developers | Freshservice Can someone help me how to update custom fields for Asset types.

-Soujanya.