Add API to add page headings from within Vue components

[ptandler]

Feature request

What problem does this feature solve?

Currently, it is not possible to add headings that show up in TOC or sidebar from within Vue component templates.

An API to add page headings would allow components to make use of the sidebar="auto" feature.

(See related issue #1423 or https://stackoverflow.com/questions/55328002/how-to-generate-headings-from-within-vue-components-in-vuepress)

What does the proposed API look like?

I'm not that familiar with the VuePress architecture that I dare to propose an API.

How should this be implemented in your opinion?

Is there anything that is executed for components during build time?

Are you willing to work on this yourself?

If I get some help in designing such an API, I am willing.

[larionov]

We would like to have such API too
@ulivz can we have some reply from core team if this feature will be considered so we can decide if we can try working on it?

[fmonper1]

This would be a perfect feature when rendering sections from a JSON file. If theres anything I can do to help Ill do so willingfully!

[staghouse]

Any update on this?