Custom Vue.js Data Analysis Plugin Development

I need a custom plugin named Classical Data Grid, similar to the Perspective (Finos) Data Grid Plugin. The plugin should be built using Vue.js and is meant for data analysis on web applications.

Key Requirements:
- Classical Pivot Format like Excel
- Row headers grouping with expand/collapse
- Export functionality as CSV or XLSX
- Subtotal hide/unhide feature
- Maintain UI features similar to Data Grid

The ideal freelancer should have:
- Strong expertise in Vue.js
- Experience with data grid and pivot functionalities
- Familiarity with CSV/XLSX export features
- UI/UX design skills for web applications

Delivery expected within 7 days.