📝 add MrkdwnElement to text on Option
📝 add MrkdwnElement to text on Option

https://api.slack.com/reference/block-kit/composition-objects#option 

> Overflow, select, and multi-select menus can only use plain_text objects, while radio buttons and checkboxes can use mrkdwn text objects.
slackapi/node-slack-sdk,slackapi/node-slack-sdk,slackapi/node-slack-sdk,slackhq/node-slack-client,slackapi/node-slack-sdk