I use (and love) Neovim with the Telescope plugin for programming.

Telescope has an extension for bookmarks that allows you to rapidly search across bookmarks and open them in the browser directly from inside Neovim.

Any chance you could work with the authors of the plugin to add support for Raindrop.io?

Here's a video showing how the extension works:

And here's a link to an issue I created in the extension asking for Raindrop.io support: