Hi @jitsuko, thank you for getting in touch.
At this stage there’s no built in way to display custom field data with block themes. Please see https://www.ads-software.com/support/topic/how-to-display-custom-fields-in-wp-6-1-fse-pages/
From this discussion it sounds like there is a Custom Fields block provided by ACF which will allow you to display data in pages, without needing to edit any PHP templates. I have not been able to test this version of the plugin so I’m unable to confirm if it works. If not, there may be other free plugins available on www.ads-software.com that allow you to display custom field data in blocks.
If this doesn’t resolve the issue, please feel free to get in touch again and I will provide some PHP code which lets you display custom field data in blocks with shortcodes (how it’s done in the pro version)