Making a clip convex in the center

Guys,
Which node should I use to bulge the center portion of a clip lens distortion node stretches the edges I want this bulge/convex effect to spread from center towards sides for a transition I have in mind. Pls suggest me how to achieve it? TIA

You could try the 'dent' tool and see if it does what you're looking for.

You could try the 'dent' tool and see if it does what you're looking for.

Thx Sander,
I think this is the best I can do with fusion.

What do u think, Is after effects better for transitions?

No, I don't think it is. Maybe it's slightly easier if you're coming from AE, but there is hardly anything you can do in AE, that you can't do in Fusion. I overlooked the transition part of your original post, so I wasn't taking the transition part into consideration.