Unfortunately, blocks can save data only to its own. The post meta allows only 1 pair of key-value, but you can add many blocks in a post. So, if that's possible, that might be confusing.
In order to use meta values in a block template, you can simple register meta fields normally with Meta Box, and use helper functions rwmb_meta to get them to show.
Would you add in your roadmap to save meta values as well?
As I explain in the previous reply, this doesn't work because you can add multiple instances same block. If one field in each blog has different values, then there's no way to decide which value will be save in the post meta.
What are the limitations for template.php? I'm trying to use rwmeta and WordPress Functions like the_excerpt, the_post_thumbnail, etc. But they does not work.
Just a note: when you use these helper functions, don't forget to use the parameter $post_id. If you want to use other WordPress functions, remember to use it as well, or you'll get the wrong info when preview the block in the edit screen.
If one field in each blog has different values, then there’s no way to decide which value will be save in the post meta.
Anh, I understand your point, but the fact is that blocks are created by aware developers and Gutenberg itself gives the possibility of storing data in post meta. (For example, it is enough to allow one such block per post and potential confusion is over)
I think there are many use cases for this.
An instant example from me five minutes ago: I want to create a block including editable featured image and it would be great if this advice would work in MB Blocks: https://metabox.io/support/topic/adding-fields-to-featured-image-metabox/
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