You can use tags to inject subscriber fields.

wp_editor( 'html', 'Content', [ 'text_font_family' => $composer['text_font_family'], 'text_font_size' => $composer['text_font_size'], 'text_font_weight' => $composer['text_font_weight'], 'text_font_color' => $composer['text_font_color'], 'background' => $background ] ) ?>
size('border-radius', __('Border radius', 'advanced-composer-blocks-for-newsletter')) ?>
color('background-color', __('Background color', 'advanced-composer-blocks-for-newsletter')) ?>
color('border-color', __('Border color', 'advanced-composer-blocks-for-newsletter')) ?>

Padding

size('padding-left', __('← Left', 'advanced-composer-blocks-for-newsletter')) ?> size('padding-top', __('↑ Top', 'advanced-composer-blocks-for-newsletter')) ?>size('padding-bottom', __('↓ Bottom', 'advanced-composer-blocks-for-newsletter')) ?> size('padding-right', __('→ Right', 'advanced-composer-blocks-for-newsletter')) ?>

Border

size('border-left', __('← Left', 'advanced-composer-blocks-for-newsletter')) ?> size('border-top', __('↑ Top', 'advanced-composer-blocks-for-newsletter')) ?>size('border-bottom', __('↓ Bottom', 'advanced-composer-blocks-for-newsletter')) ?> size('border-right', __('→ Right', 'advanced-composer-blocks-for-newsletter')) ?>

Box shadow

color('box-shadow-color', __('Color', 'advanced-composer-blocks-for-newsletter')) ?> size('box-shadow-x', __('↔ X-offset', 'advanced-composer-blocks-for-newsletter')) ?> size('box-shadow-y', __('↕ Y-offset', 'advanced-composer-blocks-for-newsletter')) ?> size('box-shadow-blur', __('Blur', 'advanced-composer-blocks-for-newsletter')) ?> size('box-shadow-spread', __('Spread', 'advanced-composer-blocks-for-newsletter')) ?>

block_commons() ?>