General support in using @channel, @here or date formatting with slack can be found herearrow-up-right.
Upon Creating the Connector Auth in Locoia, you will be taken to a screen to authenticate your Slack space:
Locoia ConnectorAuth general docs
Overview of Slackarrow-up-right
Register your webhooksarrow-up-right
In order to format messages, check out this article from Slackarrow-up-right.
The most common request will be sending html links, which can be done like (copied from Slack's docs):
Last updated 4 years ago
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<http://www.example.com|This message *is* a link>