Adjustable Mask?

I’m new(ish) to Blocs/Bootstrap/Web so apologies for the rookie question. I like the bloc mask feature for putting a semi opaque fill over a background image, but was wondering if there’s a way to have a solid color fade in from 0 to 100 as the user scrolls that section into view from below.

I attached a picture to hopefully help explain.

Also, a general question about Blocs. I’m a motion designer, and got Blocs 6 only knowing the very basics of web. I’d never heard of bootstrap, etc. Is there a general topic or video creator that fills in the gaps between me and someone who is good with Blocs?

I subscribed to the Blocs Masters Videos, but they jump in assuming the viewer knows the basics (which i’m sure most do haha). I’m figuring things out but this is so much different than print/digital!

ty in advance