Here is a list of available Descriptors for PowerBlocks. Below is how these descriptors will display in the builder.
custom_block
custom_block
color
checkbox
dimension
feed
feed_field
field_or_expr
font_spec
font_style
gravity
height
html
image
key
layer
margin
text
text_box
text_only
transition
url
variable_name
view
Here is how these descriptors will look in the Block
