Slack Header Block Documentation https://api.slack.com/reference/block-kit/blocks#header   Block Kit Builder Example [Block Kit Builder](https://app.slack.com/block-kit-builder/T02SWT9LF#%7B%22type%22:%22home%22,%22blocks%22:%5B%7B%22type%22:%22header%22,%22text%22:%7B%22type%22:%22plain_text%22,%22text%22:%22Budget%20Performance%22%7D%7D,%7B%22type%22:%22divider%22%7D,%7B%22type%22:%22section%22,%22fields%22:%5B%7B%22type%22:%22mrkdwn%22,%22text%22:%22*Current%20Quarter*%5CnBudget:%20$18,000%20(ends%20in%2053%20days)%5CnSpend:%20$4,289.70%5CnRemain:%20$13,710.30%22%7D,%7B%22type%22:%22mrkdwn%22,%22text%22:%22*Top%20Expense%20Categories*%5Cn:airplane:%20Flights%20%C2%B7%2030%25%5Cn:taxi:%20Taxi%20/%20Uber%20/%20Lyft%20%C2%B7%2024%25%20%5Cn:knife_fork_plate:%20Client%20lunch%20/%20meetings%20%C2%B7%2018%25%22%7D%5D%7D,%7B%22type%22:%22context%22,%22elements%22:%5B%7B%22type%22:%22image%22,%22image_url%22:%22https://api.slack.com/img/blocks/bkb_template_images/placeholder.png%22,%22alt_text%22:%22placeholder%22%7D%5D%7D,%7B%22type%22:%22header%22,%22text%22:%7B%22type%22:%22plain_text%22,%22text%22:%22Expenses%20Awaiting%20Your%20Approval%22%7D%7D,%7B%22type%22:%22divider%22%7D,%7B%22type%22:%22context%22,%22elements%22:%5B%7B%22type%22:%22mrkdwn%22,%22text%22:%22Submitted%20by%22%7D,%7B%22type%22:%22image%22,%22image_url%22:%22https://api.slack.com/img/blocks/bkb_template_images/profile_3.png%22,%22alt_text%22:%22Dwight%20Schrute%22%7D,%7B%22type%22:%22mrkdwn%22,%22text%22:%22*Dwight%20Schrute*%22%7D%5D%7D,%7B%22type%22:%22section%22,%22text%22:%7B%22type%22:%22mrkdwn%22,%22text%22:%22*Team%20Lunch%20(Internal)*%5CnCost:%20*$85.50USD*%5CnDate:%20*10/16/2019*%5CnService%20Provider:%20*Honest%20Sandwiches*%20%20%5CnExpense%20no.%20*%3Cfakelink.toUrl.com%7C#1797PD%3E*%22%7D,%22accessory%22:%7B%22type%22:%22image%22,%22image_url%22:%22https://api.slack.com/img/blocks/bkb_template_images/creditcard.png%22,%22alt_text%22:%22credit%20card%22%7D%7D,%7B%22type%22:%22actions%22,%22elements%22:%5B%7B%22type%22:%22button%22,%22text%22:%7B%22type%22:%22plain_text%22,%22text%22:%22Approve%22,%22emoji%22:true%7D,%22style%22:%22primary%22,%22value%22:%22approve%22%7D,%7B%22type%22:%22button%22,%22text%22:%7B%22type%22:%22plain_text%22,%22text%22:%22Decline%22,%22emoji%22:true%7D,%22style%22:%22danger%22,%22value%22:%22decline%22%7D,%7B%22type%22:%22button%22,%22text%22:%7B%22type%22:%22plain_text%22,%22text%22:%22View%20Details%22,%22emoji%22:true%7D,%22value%22:%22details%22%7D%5D%7D,%7B%22type%22:%22divider%22%7D,%7B%22type%22:%22context%22,%22elements%22:%5B%7B%22type%22:%22mrkdwn%22,%22text%22:%22Submitted%20by%22%7D,%7B%22type%22:%22image%22,%22image_url%22:%22https://api.slack.com/img/blocks/bkb_template_images/profile_2.png%22,%22alt_text%22:%22Pam%20Beasely%22%7D,%7B%22type%22:%22mrkdwn%22,%22text%22:%22*Pam%20Beasely*%22%7D%5D%7D,%7B%22type%22:%22section%22,%22text%22:%7B%22type%22:%22mrkdwn%22,%22text%22:%22*Flights%20to%20New%20York*%5CnCost:%20*$520.78USD*%5CnDate:%20*10/18/2019*%5CnService%20Provider:%20*Delta%20Airways*%5CnExpense%20no.%20*%3Cfakelink.toUrl.com%7C#1803PD%3E*%22%7D,%22accessory%22:%7B%22type%22:%22image%22,%22image_url%22:%22https://api.slack.com/img/blocks/bkb_template_images/plane.png%22,%22alt_text%22:%22plane%22%7D%7D,%7B%22type%22:%22actions%22,%22elements%22:%5B%7B%22type%22:%22button%22,%22text%22:%7B%22type%22:%22plain_text%22,%22text%22:%22Approve%22,%22emoji%22:true%7D,%22style%22:%22primary%22,%22value%22:%22approve%22%7D,%7B%22type%22:%22button%22,%22text%22:%7B%22type%22:%22plain_text%22,%22text%22:%22Decline%22,%22emoji%22:true%7D,%22style%22:%22danger%22,%22value%22:%22decline%22%7D,%7B%22type%22:%22button%22,%22text%22:%7B%22type%22:%22plain_text%22,%22text%22:%22View%20Details%22,%22emoji%22:true%7D,%22value%22:%22details%22%7D%5D%7D%5D%7D) > A guide how to implement new components could be a good idea to allow community to contribute with new blocks.
Slack Header Block Documentation
https://api.slack.com/reference/block-kit/blocks#header
Block Kit Builder Example
Block Kit Builder