HDL or Rest API to load data to Multiple attribute time card field

Summary:

I have the Multiple attribute time card field as shown in below image. I have a requirement to add around 2000 values in the expenditure type name.

Is there any HDL or Rest api available which can load the data to Multiple attribute time card field.

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):