Try something like this - Diamond sockets represent _multidata_ whereas circle sockets represent _single data_ - You can go circle to diamond, but not diamond to circle. _HOWEVER_ - you can draw a single data value from a multidata set by using an Attribute Statistic Node. In the example below, I also added a _Value_ node with _#frame_ written in the field to make the value correspond with the current frame in real time.

[![Geometry][1]][1]


  [1]: https://i.sstatic.net/9PPKN.png