Prevent custom blocks loading globally

Hi all,
Is there a way to prevent custom block stylesheets loading globally?

@Hannah stylesheets included on Block action should be loaded only when the block is used.

It is also good idea to scope CSS rules to the block class:

.my-block {…}
.my-block h1 {…}

You can now in Pinegrow activate to load only assets for the used blocks. See also here.