πCustom Widget (HTML Widget)
The Reporter supports adding custom HTML Widget. That custom widget will show up inside sidebar on Posts with sidebar pages.
To add Custom Widget:
Go to Settings > Design & branding from the admin menu and click Customize
Click Site-wide in the Design settings sidebar on the right
Find HTML WIDGET text input
Paste HTML code, prepared for your widget and click Save
To add CSS-styles, go to Settings > Code Injection
Paste your CSS code inside Site header text input (Your CSS code should be inside HTML tag <style></style>)

To add JavaScript code, go to Settings > Code Injection
Paste your JavaScript code inside Site footer text input (Your JavaScript code should be inside HTML tag <script></script>)

TO ADD 'STICKY' EFFECT:
To add "sticky" effect to this widget (so It will stick to the screen when you will scroll page down) you can take this CSS and Javascript code:
CSS:
JavaScript:
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