There is a proposal from UML designers, but, nevertheless, this is not part of the standard.
If there were no template parameters, an object "a" of type "A" could be like this:
+--------------------+
| a: A |
+--------------------+
| [+] doSomething(); |
+--------------------+
Object "a", which is a template "a", with a parameter of type "Foo", can be represented as follows:
+
+
| +
| a: A |
+
| [+] doSomething(); |
+
, U.M.L., , , , "a", . " ".
.