Nextcloud Installation + subtitle support for the video player

Hi, We share videos with subtitles with our customers. The videos will be uploaded in a single admin account and they'll be shared with other nextcloud users which we'll create one by one later. We'd like a customized Nextcloud installation. Installing Nextcloud is the easy part. Here comes the not so easy part: The default video player in Nextcloud comes with very little subtitle support (almost no support). We'd like a customized player which supports subtitle files (preferably .srt format). 1- We'd like to be sure that the subtitle files can't be downloaded 2- The video files with subtitles need to work on all kinds of operating systems and browsers both on computers and mobile devices 3- The default video player requires to keep the video file and subtitle file in the same directory. We'd like to keep the subtitle files in a different directory. Let's not waste each others times. Please contact if you can meet all our requirements.