can we use Java Script api in power BI Reports on Power BI Report Server

I mistakenly thought you could, but it looks like you can't yet. Here's the post where I was corrected:

https://community.powerbi.com/t5/Report-Server/Write-back-comments-from-visual-from-report-on-report-server/m-p/423485#M5792

Vote on the idea here:

https://ideas.powerbi.com/forums/265200-power-bi-ideas/suggestions/20324803-power-bi-javascript-api-support-for-report-server