Update field value in EPIC based on Story custom filed value in cloud

[Sindhu]

Hello Team,

We have Epic and under this we have stories.

ex: Epic name:Test epic

and it has 10 stories 

Field Name:"Epic status" and it is single select dropdown-it is on the epic screen.

Epic and story have their own workflow.

if any one of the story "status"  is "Blocked "in that epic , the Field  "Epic status" should automatically change to "Blocked".

Please suggest me how to achieve this