Can I create default post content?

Many of my posts follow the same format. I’d like to create a custom page/post template that includes the standard headings that I use, rather than check the order each time.

Is it possible to populate the {{content}} of a new page/post with default content? E.g.

Heading 1

Some text here

Sub-heading

Some other text here

Heading 2

…etc.

Thanks!