Video Player Conversion asset not showing form

I just found the solution for the problem. You need to set the variable and parse it as json like the following example:

 {% set conversion_assets = {"type":"FORM","id":module.form.form_id,"position":"PRE"} %}
 {% video_player "embed_player" 
 overrideable=False 
 type={{ module.video.player_type || 'scriptV4' }} 
 full_width={{ module.video.size_type == 'auto_full_width' }} 
 hide_playlist=True 
 viral_sharing=False 
 embed_button=False 
 auto_play=True 
 width='1920', height='1080' 
 player_id={{ item.video }} 
 conversion_asset={{ conversion_assets|tojson|safe }}
 %}