The obvious problem with this approach: destroying a jammer in foreign country with a missile is an act of war.

Janming is an act of war too.

Sure, use energy beams to strike their jammers.

Missels are expensive. Jammers can be farther away than a cheap drone can reach.

Jammers often move. Your missle often cannot manovure well enough to hit. jammers often turn off - if you missle is detected they turn the jammer off and move it. They are often running more than one jammer so getting one to turn off isn't going to matter.

Be an interesting feature to add to the AGM-88E.