In slack’s single user select dropdown, you can only see all the users in the team, not specific users. What I want to do, is show a specific list of users in a channel in the dropdown, along with their pfps. Problem is, for some reason, the slack’s conversation select has a filter property but the users select does not.
https://api.slack.com/reference/block-kit/block-elements#users_select
https://api.slack.com/reference/block-kit/block-elements#channels_select

I am implementing slack bot where user will execute the slash command and bot will post the ephemeral message to the chhanel.