Cast plex movie

hi all, i’m trying to cast a plex movie from a node red action. I see it’s possible but I think i’m doing something wrong

Im following the guide here Google Cast - Home Assistant and trying to setup the json:
{"media_content_id":"plex://{"library_name": "Movies", "title": "Spirited"}'","media_content_type":"movie","announce":"false"}"

just getting api error - extra keys not allowed - any idea what i’m doing wrong? thank you

Ok i got it going within automation by following this Google Cast - Home Assistant. so i shoudl be able to get it going in node red.

i can’t out how to insert the timestamp for where to start the movie tho