ffmpeg – Fmpeg in mkv convert srt to webvtt

there are 2 srt files in my mkv file when I use this code
ffmpeg -i input.mkv -c copy -hls_list_size 0 -f hls output.m3u8
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It gives the error requesting webvtt. How can I convert srt to webvtt and output to hls for this? It takes a long time to extract srt and convert webvtt one by one. Can you help me if there is an easy way to do this?

It gives the error requesting webvtt. How can I convert srt to webvtt and output to hls for this? It takes a long time to extract srt and convert webvtt one by one. Can you help me if there is an easy way to do this?

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