Roof Repair experts - advice?

I have a roof that has a "sag" kinda in the middle as pictured. Is there anyone who as fixed this without replacing the entire roof as that is really not an option and the roof is in good shape. Can you put a metal beam rod in place to give support and sandwich it to give it an even support like a roof beam?. I was thinking I could have a metal support rod out of 1x1 steel tubing and mount it into place to give support with bolts through the roof and sealed up properly. it can pretty easily be straighted out by pushing by hand and there is no delamination. Otherwise the roof is in great shape.

I also have a small (size of a quarter" small tear in the roof how has anyone else fixed this?

Any advice would be a great help. I did a search but did not find much to help me with these issues.

Thanks!